Christina Lydia Chen, DO
Rheumatology Physician · Covina, CA
Christina Lydia Chen, DO is a rheumatology physician with a practice address in Covina, California, and NPI 1952661829, issued on May 24, 2012. Check the license (California 20A13361, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Christina Lydia Chen
- Credential
- DO
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- 20A13361 CA
Self-reported in NPPES; status is on the state search - Practice location
- 500 W San Bernardino RD Ste A, Covina, CA 91722
- Phone
- (626) 966-1909
- Enumerated
- May 24, 2012
- Record last updated
- Jul 13, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (626) 209-0331
- Medicare enrollment
- Enrolled (PECOS I20170918002444); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 926 in California → Look up another NPI →
Also registered at 500 W San Bernardino RD Ste A
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ariel Bryant, PARheumatology Physician1578106597
- Jennifer Bui, PHYSICIAN ASSISTANTMedical Physician Assistant1578003018
- Yanisa Chuenkasamekul, PA-CRheumatology Physician1184266678
- Stella Lee, PA-CPhysician Assistant1457163784
- Samy Metyas, MDRheumatology Physician1831104694
- Roshan Patel, M.D.Rheumatology Physician1457709131
Verify Christina Lydia Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A13361Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.1 times the Medicare Part D claims of the average rheumatology physician in 2024
4,145 Medicare Part D claims for 650 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D. 196 claims were for opioids.
Most prescribed
- Hydroxychloroquine Sulfate265 claims
- Prednisone253 claims
- Gabapentin228 claims
- Baclofen217 claims
- Pregabalin197 claims
- Alendronate Sodium193 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 87.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $4,755.51
228 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 4,486 providers of this specialty with any payment received $8,538.33 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Samy Metyas M.D. IncCovina, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Christina Lydia Chen among 926 rheumatology physician records in California
Christina Lydia Chen, DO is one of 926 rheumatology physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 71% of them.
- NPI issued2012 · 71% of these records are older, 25% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2012 · median 2003 among the 641 with a school on file
- Record last updated2017 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in California
There are 926 rheumatology physician records in California.
All 926 in California → Every provider in Covina → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Ariel Bryant, PACovina, CA 917221578106597
- Yanisa Chuenkasamekul, PA-CCovina, CA 917221184266678
- Samy Metyas, MDCovina, CA 917221831104694
- Roshan Patel, M.D.Covina, CA 917221457709131
- Anne Quismorio, MDCovina, CA 917221073740825
- Kavoos Nazeri, M.D.Rancho Cucamonga, CA 917301477731644
- John Finley, DOChino, CA 917101922042076
- Sapna Rasania, M.D., M.P.H.Chino, CA 917101427336759
Common questions
What is Christina Lydia Chen, DO's NPI number?
Christina Lydia Chen, DO's National Provider Identifier (NPI) is 1952661829, issued on May 24, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Christina Lydia Chen, DO located?
The NPPES record lists a practice address at 500 W San Bernardino RD Ste A, Covina, CA, 91722. Phone: (626) 966-1909. Providers update this record themselves, so call before visiting.
How can I verify Christina Lydia Chen, DO's license?
NPPES lists California license number 20A13361, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Christina Lydia Chen, DO prescribe under Medicare Part D?
In 2024, Christina Lydia Chen, DO had 4,145 Medicare Part D claims for 650 beneficiaries; the average among rheumatology physician prescribers was 1,978. Part D covers Medicare prescriptions only.
What is Christina Lydia Chen, DO's MIPS final score?
The 2023 MIPS final score is 87.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.