Find an in-network dentist from over 1,000 insurance plans

Add your insurance to see in-network doctors
insurance link for 223
insurance link for 222
insurance link for 212
insurance link for 239
insurance link for 235
See all (1,000+)
315 verified United Concordia Dentists in Scottsdale, AZ
Zocdoc verifies all providers before they can appear in Zocdoc search results. Every provider that appears in search is open to new patients.
Out-of-network providers
Availability last updated 06/05/2026
Availability last updated 06/05/2026
Dentist
20 mi · 5970 S Cooper Rd, Ste 1, Chandler, AZ 85249
Out-of-network
Accepting new patients ·
Read bio
Dr. Pavel Dubinetsky is a dentist. He practices at Impressions Dental in Chandler, AZ. He obtained his dental degree from Roseman University of Health Sciences. Dr. Dubinetsky reviews each patient's dental history and current concerns before recommending a course of action. During his consultations...Click to read more
Next available: Fri, Jul 10
Orthodontist
5.00
·3 reviews
I loved the way Lupe, the orthodontist coordinator, helped us understand the process, how the insurance worked for my son's treatment, payment, and my son's dental health information. Nothing like at any other place. The dentist was great at explaining to my son the care of his braces and teeth. A...Click to read more
16.5 mi · 5422 Thunderbird Rd, Suite 20, Glendale, AZ 85306
Out-of-network
Accepting new patients · Highly recommended · Excellent wait time ·
Read bio
Dr. Timothy Yu, D.M.D., M.S., is a highly skilled orthodontist practicing at GD Avondale, GD Greenfield, GD Surprise, and GD Palm Valley. A graduate of Temple University School of Dentistry, Dr. Yu earned his dental degree in 2005 and completed his post-graduate studies in Orthodontics in 2007. Dr...Click to read more
Next available: Mon, Jun 8
Dentist
4.00
·7 reviews
Dentist did not come across as caring. I will be looking for another dentist with a caring bedside manner. - Feb 3, 2025 by Deirdre G.Click to read more
27.5 mi · 13920 W Camino Del Sol, Sun City West, AZ 85375
Out-of-network
Accepting new patients · Excellent wait time ·
Read bio
Dr. Christopher Antczak has over 20 years of experience and a passion for compassionate dental care. A graduate of the University of Michigan School of Dentistry, Dr. Antczak is highly skilled in all aspects of general dentistry, with a focus on molar endodontics and surgical extractions. Dr. Chris...Click to read more
Next available: today
Orthodontist
4.85
·39 reviews
Dr. is very fast and answered all my questions. Love her staff. by DGClick to read more
24 mi · 20542 N Lake Pleasant Rd, Ste 113, Peoria, AZ 85382
Out-of-network
Accepting new patients · Highly recommended · Excellent wait time ·
Read bio
Dr. Hojae Choi is American Board Certified Orthodontist and Specializing in Orthodontics. She is originally from Seoul, Korea, where she grew up shadowing her orthodontist father. Having been exposed to the field of dentistry and orthodontics since an early age, Dr. Choi found her interest in servin...Click to read more
Dentist
0.5 mi · 3226 N Miller Rd, #1, Scottsdale, AZ 85251
Out-of-network
Accepting new patients ·
Read bio
Dr. Roy Shim believes being a dentist is not just about working on teeth but understanding patients' overall medical conditions and their impact on oral health. Committed to continuing education, he earned his Doctor of Dental Surgery degree from Northwestern University Dental School, receiving a sc...Click to read more
Dentist
5.00
·1 review
All staff are very friendly, and they assist with payment plans should something arise. by JMClick to read more
2 mi · 2899 N 87th St, #100, Scottsdale, AZ 85257
Out-of-network
Accepting new patients · Highly recommended · Excellent wait time ·
Read bio
Dr. Bradley DeMark is a dentist who serves the people in Scottsdale, AZ. At A 101 Dental Care, PC, he provides in-person consultations, follow-ups, and other oral health services. Dr. DeMark graduated with a dental degree from the Marquette University School of Dentistry. He is a member of the Amer...Click to read more
Dentist
5.00
·26 reviews
I would recommend this family density. Down to earth, personable - Dec 18, 2025 by nicole C.Click to read more
2 mi · 2899 N 87th St, #100, Scottsdale, AZ 85257
Out-of-network
Accepting new patients · Highly recommended · Excellent wait time ·
Read bio
Dr. Mansourian graduated from Baylor College of Dentistry in Dallas, TX, and has been practicing dentistry since 1995. He worked in the industry for three years before opening his own private dental practice in 1998. Seven years later, he opened another practice in South Scottsdale and was recognize...Click to read more
Dentist
5.00
·1 review
All staff are very friendly, and they assist with payment plans should something arise. by JMClick to read more
2 mi · 2899 N 87th St, #100, Scottsdale, AZ 85257
Out-of-network
Accepting new patients · Highly recommended · Excellent wait time ·
Read bio
Dr. Bradley DeMark is a dentist who serves the people in Scottsdale, AZ. At A 101 Dental Care, PC, he provides in-person consultations, follow-ups, and other oral health services. Dr. DeMark graduated with a dental degree from the Marquette University School of Dentistry. He is a member of the Amer...Click to read more
Dentist
5.00
·26 reviews
I would recommend this family density. Down to earth, personable - Dec 18, 2025 by nicole C.Click to read more
2 mi · 2899 N 87th St, #100, Scottsdale, AZ 85257
Out-of-network
Accepting new patients · Highly recommended · Excellent wait time ·
Read bio
Dr. Mansourian graduated from Baylor College of Dentistry in Dallas, TX, and has been practicing dentistry since 1995. He worked in the industry for three years before opening his own private dental practice in 1998. Seven years later, he opened another practice in South Scottsdale and was recognize...Click to read more
Dentist
5 mi · 4202 N 32nd St, Ste B, Phoenix, AZ 85018
Out-of-network
Accepting new patients
Dentist
5.5 mi · 8980 N 90th St, #130, Scottsdale, AZ 85258
Out-of-network
Accepting new patients ·
Read bio
Dr. David Ngo provides general and cosmetic dentistry services at S&L Dental in Scottsdale and Paradise Valley, Arizona. He has extensive experience in general and cosmetic dentistry, including full mouth restoration, dental veneers, crowns, bridges, dental implants, wisdom teeth extractions, Invisa...Click to read more
Dentist
5.00
·2 reviews
Just absolutely incredible! Very great with patients who struggle with dental anxiety! - May 1, 2024 by Johannah A.Click to read more
6.5 mi · 8438 E Shea Blvd, Ste 100, Scottsdale, AZ 85260
Out-of-network
Accepting new patients · Highly recommended · Excellent wait time ·
Read bio
Dr. Jelena Djurdjic, or “Dr. DJ” as her patients call her, grew up near Milwaukee, WI. She earned her Doctor of Dental Surgery degree with honors from Marquette University. Dr. DJ moved to Arizona seeking sunshine and beautiful weather, and she certainly doesn't miss the freezing temperatures of Wis...Click to read more
Dentist
5.00
·3 reviews
Excellent - Feb 14, 2025 by Allan B.Click to read more
6.5 mi · 8438 E Shea Blvd, Ste 100, Scottsdale, AZ 85260
Out-of-network
Accepting new patients · Highly recommended · Excellent wait time ·
Read bio
Dr. Burke Frei is originally from St. George, Utah. He came to Arizona in 2006, after graduating from Marquette University School of Dentistry with his Doctor of Dental Surgery degree. Dr. Frei practices both general and cosmetic dentistry. His passion is for cosmetics, including porcelain veneers, ...Click to read more
Dentist (Virtual)
5.00
·1 review
Great! Crystal is exceptional!! by SHClick to read more
Mesa, AZ
Out-of-network
Accepting new patients · Offers video visits · Highly recommended · Excellent wait time ·
Read bio
Please note: While Vibrant Dentistry is a self-pay office, we’re happy to submit claims to your insurance provider on your behalf to help maximize your benefits. Dr. Metz – General & Cosmetic Dentist Originally from North Platte, Nebraska, Dr. Metz earned his Doctor of Dental Surgery (D.D.S.) degr...Click to read more
Dentist
5.00
·1 review
Great! Crystal is exceptional!! by SHClick to read more
8.5 mi · 2058 S Dobson Rd, STE 8, Mesa, AZ 85202
Out-of-network
Also offers video visits · Accepting new patients · Highly recommended · Excellent wait time ·
Read bio
Please note: While Vibrant Dentistry is a self-pay office, we’re happy to submit claims to your insurance provider on your behalf to help maximize your benefits. Dr. Metz – General & Cosmetic Dentist Originally from North Platte, Nebraska, Dr. Metz earned his Doctor of Dental Surgery (D.D.S.) degr...Click to read more
Dentist
5.00
·1 review
I love Breton Dental! I've truly learned how to take care of my teeth since being here and also they went above and beyond when they sent my trays to another state I was in! They are THE BEST! by DCClick to read more
8.5 mi · 1731 W Baseline Rd, Ste 104, Mesa, AZ 85202
Out-of-network
Also offers video visits · Accepting new patients · Highly recommended · Excellent wait time ·
Read bio
Dr. Peterkin graduated cum laude from the honors college as a presidential scholar with a Bachelor of Science (BS) in Chemistry/Pre-Dental Studies from the historically black Bethune-Cookman University in Daytona Beach, Florida. She later completed a Masters in Biomedical Sciences from Midwestern U...Click to read more
Dentist
11.5 mi · 1170 N Gilbert Rd, Ste 125, Gilbert, AZ 85234
Out-of-network
Accepting new patients ·
Read bio
Dr. Brent Call offers a wealth of dental expertise to the Phoenix, AZ community. His comprehensive approach encompasses both general and specialized treatments, driven by a combination of thorough education and significant hands-on experience. He is dedicated to providing exceptional results while e...Click to read more
Dentist
11.5 mi · 1170 N Gilbert Rd, Ste 125, Gilbert, AZ 85234
Out-of-network
Accepting new patients ·
Read bio
Dr. Roy Howard's distinguished dental career began with his graduation from the University of Washington School of Dentistry in 1975, where he earned the prestigious 'Top Oral Pathology Award.' His exceptional skills were further recognized during his training alongside anesthesia residents at the U...Click to read more
Dentist (Virtual)
5.00
·27 reviews
Amazing as usual. Nervous about 1st root canal but it wasn't bad at all. 5 stars by SHClick to read more
GILBERT, AZ
Out-of-network
Accepting new patients · Offers video visits · Highly recommended · Excellent wait time ·
Read bio
Kathy Jacobsen Contemporary Dentistry is an unrestricted insurance provider. We can file claims for all PPO plans with out of network coverage. We also have an in house insurance plan for patients without insurance coverage. Dr. Kathy Jacobsen has been serving the East Valley and surrounding areas...Click to read more
Dentist
4.00
·1 review
- Apr 27, 2026 by Montana N.Click to read more
12.5 mi · 3327 E Baseline Rd, Gilbert, AZ 85234
Out-of-network
Accepting new patients · Excellent wait time ·
Read bio
Dr. Nguyen is a compassionate and dedicated dentist who is proud to be part of the Phoenix Dental Partners team. Personally selected by Dr. Aaron Jeziorski to join the practice, she shares the same commitment to providing high-quality, patient-centered dental care in a comfortable and welcoming envi...Click to read more
Periodontist
6 mi · 4020 N 24th St, Phoenix, AZ 85016
Out-of-network
Accepting new patients ·
Read bio
Dr. Stephen Folson DDS, MS, PC. Dr. Folson received his DDS at Loyola University of Chicago in 1979. He subsequently completed a VA General Practice Residency with University of Michigan. Thereafter, Steve returned to Loyola for a two-year Residency in Periodontics and received a Masters Degree and ...Click to read more
Dentist
14.5 mi · 8507 N 51st Ave, Glendale, AZ 85302
Out-of-network
Accepting new patients ·
Read bio
Dr. Roy Shim believes being a dentist is not just about working on teeth but understanding patients' overall medical conditions and their impact on oral health. Committed to continuing education, he earned his Doctor of Dental Surgery degree from Northwestern University Dental School, receiving a sc...Click to read more
Dentist
4.72
·18 reviews
The staff was extremely personable and explained everything making sure I understood my treatment plan - Feb 16, 2024 by Haley K.Click to read more
17 mi · 6637 W Peoria Ave, D-2, Glendale, AZ 85302
Out-of-network
Accepting new patients ·
Read bio
Dr. Nima was first introduced to dentistry by his aunt when he was 12 years old and needed a tooth filled. In that moment, he realized how dentistry can make a difference in one's life by relieving pain and discomfort. He went on to earn his Doctor of Dental Surgery degree from Midwestern University...Click to read more
Oral Surgeon
5.00
·21 reviews
I had an amazing experience with Dr. Mirdamadi and his team. They were professional, kind and my recovery was smooth. by JPClick to read more
11 mi · 17767 N Scottsdale Rd, Scottsdale, AZ 85255
Out-of-network
Accepting new patients · Highly recommended · Excellent wait time ·
Read bio
Meet Dr. Paul Mirdamadi, DDS, MS! From Toronto to USC and now a board-certified Oral & Maxillofacial surgeon, specializing in dental implants, extractions, and facial trauma. Committed to top-notch care, he's dedicated to staying at the forefront of his field. His thirst for understanding the human...Click to read more
Dentist
5.00
·18 reviews
Entire staff is very friendly, efficient & have a Great Bed Side Manner. Very pleased. by SHClick to read more
21.5 mi · 7777 W Deer Valley Rd, Ste 160, Peoria, AZ 85382
Out-of-network
Accepting new patients · Highly recommended · Excellent wait time ·
Read bio
Dr. Elizabeth grew up dreaming of becoming a doctor, hoping to take care of people and make a difference in their lives. After interning with her family dentist and orthodontist, she decided dentistry was the perfect fit. Dr. Elizabeth attended the Barrett Honors College at Arizona State University ...Click to read more
Dentist
5.00
·11 reviews
Good!!:) by BHClick to read more
21.5 mi · 7777 W Deer Valley Rd, Ste 160, Peoria, AZ 85382
Out-of-network
Accepting new patients · Highly recommended · Excellent wait time ·
Read bio
Dr. Eric Larson is a general dentist in Peoria, AZ, where he welcomes patients of all backgrounds at Arrowhead Family Dentistry. He earned his dental degree from Midwestern University and is trained in the diagnosis and treatment of a variety of general dental conditions. Dr. Larson takes time to ...Click to read more
Dentist
29 mi · 42201 N 41St Dr, Anthem, AZ 85086
Out-of-network
Accepting new patients ·
Read bio
Meet Dr. Chelsea Jackson. Born and raised here in our beautiful city of Anthem, she couldn’t stay away too long after receiving her Doctor of Dental Medicine degree from Midwestern University School of Dentistry and relocating to practice in Ohio. Dr. Jackson quickly realized that the sunshine, the...Click to read more
Dentist
29 mi · 42201 N 41St Dr, Anthem, AZ 85086
Out-of-network
Accepting new patients ·
Read bio
Meet Dr. Diana Dang! A true Arizonian, she grew up in Tucson, Arizona, and graduated from the University of Arizona. Dr. Dang moved to Philadelphia to attend Temple University, where she earned her Doctor of Dental Medicine degree with honors. After graduating, she practiced dentistry in California ...Click to read more
Dentist (Virtual)
5.00
·1 review
I love Breton Dental! I've truly learned how to take care of my teeth since being here and also they went above and beyond when they sent my trays to another state I was in! They are THE BEST! by DCClick to read more
Supai, AZ
Out-of-network
Accepting new patients · Offers video visits · Highly recommended · Excellent wait time ·
Read bio
Dr. Peterkin graduated cum laude from the honors college as a presidential scholar with a Bachelor of Science (BS) in Chemistry/Pre-Dental Studies from the historically black Bethune-Cookman University in Daytona Beach, Florida. She later completed a Masters in Biomedical Sciences from Midwestern U...Click to read more
Dentist
4.93
·54 reviews
Efficient, caring, thoughtful, professional, well organized. A very good experience. by RBClick to read more
4 mi · 4519 N 40th St, Phoenix, AZ 85018
Out-of-network
Accepting new patients · Highly recommended · Excellent wait time ·
Read bio
Dr. Andrew Sloan is an Arizona native and is excited to have the opportunity to serve the healthcare needs of the Community he grew up in. After completing his undergraduate degree Dr. Sloan attended Oregon Health & Science University where he graduated with honors and received his Doctoral of Dent...Click to read more
Next available: Mon, Jun 8
Dentist
5.00
·19 reviews
I’ve been going to Dr. Payne for years. He is an excellent dentist I would highly recommend him. - Apr 19, 2026 by Doug R.Click to read more
8.5 mi · 2024 S Don Carlos, Suite A, Mesa, AZ 85202
Out-of-network
Accepting new patients · Highly recommended · Excellent wait time ·
Read bio
During his undergraduate years, he worked at the prestigious National Institute of Health (NIH) in a cancer research lab. After completing his undergraduate studies, he earned his Doctor of Dental Surgery degree from the University of Southern California Dental School, where he was a member of the D...Click to read more
Next available: Tue, Jun 9
Dentist
5.00
·21 reviews
Very easy to talk to. Sarah, the hygienist, was very thoughtful and thorough. by Karen J.Click to read more
6.5 mi · 10135 E Vía Linda, Ste C119, Scottsdale, AZ 85258
Out-of-network
Also offers video visits · Accepting new patients · Highly recommended · Excellent wait time
Next available: Mon, Jun 8
Dentist
10.5 mi · 7231 E Princess Blvd, Ste 207, Scottsdale, AZ 85255
Out-of-network
Accepting new patients ·
Read bio
Dr. Leila Shahbazi grew up in Scottsdale, AZ, and chose to stay close to home for college. She pursued her dream of becoming a dentist by attending A.T. Still University’s Arizona School of Dentistry and Oral Health in Mesa, AZ, where she earned her Doctor of Dental Medicine degree. While in dental ...Click to read more
Next available: Thu, Jun 11
Dentist
4.86
·28 reviews
Everyone treated me kind and was polite. Doctor Amanda thoroughly explained how to take care of my teeth. by DDClick to read more
18 mi · 3190 S Gilbert Rd, Ste 1, Chandler, AZ 85286
Out-of-network
Accepting new patients · Highly recommended · Excellent wait time ·
Read bio
Dr. Amanda Nelson was born and raised in northern California. She grew up in a dental office as her grandfather was a dentist. Her mother was his dental assistant and her grandmother ran the front office. She fell in love with providing exceptional and compassionate care while treating all patients ...Click to read more
Next available: Mon, Jun 8
Dentist
4.97
·29 reviews
Great friendly staff. Smooth crown preparation process. Strongly recommend this dentist. by HRClick to read more
17 mi · 5620 W Thunderbird Rd, H-4, GLENDALE, AZ 85306
Out-of-network
Accepting new patients · Highly recommended · Excellent wait time ·
Read bio
Dr. Holtan brings a wealth of experience and a deep commitment to patient care to Sublime Smiles. He values each patient’s needs and strives to deliver the highest quality dental care. His approach is centered on creating a customized treatment plan that addresses both the immediate and long-term ne...Click to read more
Orthodontist
4.85
·39 reviews
Dr. is very fast and answered all my questions. Love her staff. by DGClick to read more
12 mi · 2900 W Ray Rd, #3, Chandler, AZ 85224
Out-of-network
Accepting new patients · Highly recommended · Excellent wait time ·
Read bio
Dr. Hojae Choi is American Board Certified Orthodontist and Specializing in Orthodontics. She is originally from Seoul, Korea, where she grew up shadowing her orthodontist father. Having been exposed to the field of dentistry and orthodontics since an early age, Dr. Choi found her interest in servin...Click to read more
Next available: today
Dentist (Virtual)
Supai, AZ
Out-of-network
Accepting new patients · Offers video visits ·
Read bio
Booking with The TeleDentists is for a VIRTUAL dental consultation.Click to read more
Next available: today
Dentist (Virtual)
Supai, AZ
Out-of-network
Accepting new patients · Offers video visits ·
Read bio
Booking with The TeleDentists is for a VIRTUAL dental consultation. The provider is a licensed Dentist practicing in the state of Michigan (MI). Their license number is (2 9 0 1 6 0 1 4 4 4). Dr. Lester is a Graduate of the University of Pennsylvania School of Dental Medicine and served for two ye...Click to read more
Next available: today
Dentist (Virtual)
Supai, AZ
Out-of-network
Accepting new patients · Offers video visits ·
Read bio
Booking with The TeleDentists is for a VIRTUAL dental consultation. The provider is a licensed Dentist practicing in the state of Michigan (MI). Their license number is 2​9​0​1​6​0​2​0​9​8. Dr. Eric Westergard is a dentist experienced with emergency dental treatment, oral pain & infection, cosmeti...Click to read more
Next available: today
Dentist
4.68
·19 reviews
my experience was great! left super happy! - Mar 21, 2023 by Andria D.Click to read more
1 mi · 7600 E Camelback Rd, Ste 10, Scottsdale, AZ 85251
Out-of-network
Accepting new patients ·
Read bio
Having earned his Doctor of Dental Medicine degree from A.T. Still University in Mesa, AZ, and growing up in Gilbert, AZ, Dr. Pandya understands the dental needs of the local population. He takes pride in being extremely thorough in explaining your treatment requirements and in being very detail ori...Click to read more
Calendar Check
1-3 days

Average time it takes to be seen by a provider

Doctor
100k

Verified providers with a 4.8 average rating

Primary Care Physician
15+ years

In the business of finding quality care for patients

Patients trust Zocdoc
I had resisted counseling for a long time...I could not find anyone who had room for me...Enter Zocdoc...I am so grateful.
Victoria L
So easy to use and works EVERY time!! As a busy woman, I need to be able to schedule things quickly, and this makes that simple!! Thank you!!
Deborah P.
I will recommend Zocdoc to everyone, Excellent experience, very friendly, Top 5 STARS.
Bozena G
National Public Radio
New York Times
Yahoo
Self.com
Verge
Wall Street Journal
Frequently asked questions

How can I make a same-day appointment with a Dentist in Scottsdale who takes United Concordia insurance?

On average, patients who use Zocdoc can search for a Dentist in Scottsdale who takes United Concordia insurance, book an appointment, and see the Dentist within 24 hours. Same-day appointments are often available, you can search for real-time availability of Dentists in Scottsdale who accept United Concordia insurance and make an appointment online.


How can I find a Dentist in Scottsdale who takes United Concordia?

Zocdoc lets you search specifically for a Dentist in Scottsdale who takes United Concordia. Just choose your carrier and plan from the drop-down menu at the top of the page. If you’re not sure which plan you have, you can use Zocdoc’s insurance checker to find out.


How can I book an appointment online with a United Concordia Dentist in Scottsdale?

Zocdoc is a free online service that helps patients find United Concordia Dentists in Scottsdale and book appointments instantly. You can search for United Concordia Dentists in Scottsdale by symptom or visit reason. Based on that information, you’ll see a list of providers who meet your search criteria, along with their available appointment slots.


How can I find a female Dentist in Scottsdale who takes United Concordia insurance?

When you search for United Concordia Dentists in Scottsdale on Zocdoc, you can filter your results by gender, in addition to other criteria. That way, you’ll only see United Concordia Dentists in Scottsdale who match your preferences.


How can I find a United Concordia Dentist in Scottsdale who sees patients after hours?

On Zocdoc, you can search specifically for United Concordia Dentists in Scottsdale with availability after 5 p.m.


How can I find a top-rated United Concordia Dentist in Scottsdale?

You can use Zocdoc to find United Concordia Dentists in Scottsdale who are highly rated by other patients. These ratings are based on verified reviews submitted by real patients. Every time a patient completes an appointment booked on Zocdoc, they’re invited to review their experience. Each review must comply with Zocdoc’s guidelines.


How can I find a video visit with a Dentist online in Scottsdale?

Dentists in Scottsdale on Zocdoc who see patients through online video visits will have a purple video icon on their profiles. You can also filter your search results to show only Dentists who offer video visits.


Are video visits with a Dentist online covered by United Concordia?

Most insurers provide coverage for video visits at the same cost as in-person visits. You can search on Zocdoc specifically for Dentists in Scottsdale who accept United Concordia for video visits by selecting your carrier and plan from the drop-down menu at the top of the page. We recommend you check with your insurance carrier directly to confirm your coverage and out of pocket costs for video visits.


How can I find a United Concordia Dentist in Scottsdale who sees patients in the morning or evening?

Zocdoc lets you search specifically for a Dentist who has appointments available before 10:00 am, or after 5:00 pm. Just choose the special hours filter at the top of our search page.


How can I find a United Concordia Dentist in Scottsdale who sees patients during the weekend?

Zocdoc let's you see real-time availability for United Concordia Dentists in Scottsdale. Many United Concordia Dentists offer appointments on Saturdays and Sundays.


ZocdocDentistsPhoenix, AZScottsdale, AZUnited Concordia