Catherine Diamond, MD
Infectious Disease Physician · Orange, CA
Catherine Diamond, MD is an infectious disease physician with a practice address in Orange, California, and NPI 1649350786, issued on Oct 16, 2006. Check the license (California 000000G84863, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Catherine Diamond
- Credential
- MD
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- 000000G84863 CA
Self-reported in NPPES; status is on the state search - Practice location
- Uci Medical Center, Orange, CA 92868
- Phone
- (714) 456-8978
- Enumerated
- Oct 16, 2006
- Record last updated
- Apr 8, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20080122000292); accepts Medicare assignment
- Medical or professional school
- Albany Medical College Of Union University, 1991
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 1,119 in California → Look up another NPI →
Also registered at Uci Medical Center
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Catherine Diamond in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 000000G84863Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
7.5 times the Medicare Part D claims of the average infectious disease physician in 2024
5,190 Medicare Part D claims for 129 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D. Brand-name drugs were 34% of claims. 165 claims were for opioids.
Most prescribed
- Biktarvy549 claims
- Atorvastatin Calcium285 claims
- Gabapentin135 claims
- Symtuza133 claims
- Amlodipine Besylate131 claims
- Omeprazole130 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 MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- UC RegentsOrange, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Catherine Diamond among 1,119 infectious disease physician records in California
Catherine Diamond, MD is one of 1,119 infectious disease physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 54% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1991 · median 2003 among the 735 with a school on file
- Record last updated2008 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in California
There are 1,119 infectious disease physician records in California.
All 1,119 in California → Every provider in Orange → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Rosa Andrade, MDOrange, CA 928681093919680
- Robert Armen, M.D.Orange, CA 928681225041080
- Thomas C Cesario, MDOrange, CA 928681265512354
- Coleen Cunningham, M.D.Orange, CA 928681205999075
- Donald N Forthal, MDOrange, CA 928681215017363
- Shruti Gohil, M.D., M.P.H.Orange, CA 928681851375398
- Geeta K Gupta, MDOrange, CA 928681558441600
- Peter Heseltine, MD, FACPOrange, CA 928681487771432
Common questions
What is Catherine Diamond, MD's NPI number?
Catherine Diamond, MD's National Provider Identifier (NPI) is 1649350786, issued on Oct 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Catherine Diamond, MD located?
The NPPES record lists a practice address at Uci Medical Center, Orange, CA, 92868. Phone: (714) 456-8978. Providers update this record themselves, so call before visiting.
How can I verify Catherine Diamond, MD's license?
NPPES lists California license number 000000G84863, 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 Catherine Diamond, MD prescribe under Medicare Part D?
In 2024, Catherine Diamond, MD had 5,190 Medicare Part D claims for 129 beneficiaries; the average among infectious disease physician prescribers was 689. Part D covers Medicare prescriptions only.
What is Catherine Diamond, MD's MIPS final score?
The 2023 MIPS final score is 100 of 100. 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.