William Robert Dietrick, MD
Specialist · Pasadena, CA
William Robert Dietrick, MD is a specialist with a practice address in Pasadena, California, and NPI 1881712248, issued on Mar 26, 2007. Check the license (California G13777, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- William Robert Dietrick
- Credential
- MD
- Primary taxonomy
- Specialist 174400000X
- License number
- G13777 CA
Self-reported in NPPES; status is on the state search - Practice location
- 800 Fairmount Ave, Pasadena, CA 91105
- Phone
- (626) 397-5126
- Enumerated
- Mar 26, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest specialist records → All 5,749 in California → Look up another NPI →
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Verify William Robert Dietrick in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license G13777Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 76.6 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).
William Robert Dietrick among 5,749 specialist records in California
William Robert Dietrick, MD is one of 5,749 specialist records with a practice address in California. 30% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 40% of them.
- NPI issued2007 · 40% of these records are older, 44% newer
- In a Medicare fileYes · 30% of these records are
- In the CMS Doctors and Clinicians fileNo · 19% of these records are
- Record last updated2007 · 77% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Specialist providers in California
There are 5,749 specialist records in California.
All 5,749 in California → Every provider in Pasadena → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Alexis Anvekar, M.D.Pasadena, CA 911051306952577
- David Cantor, MDPasadena, CA 911051689646713
- Daniel Casper, MD, FACSPasadena, CA 911051740403617
- Reyneiro Castro, MDPasadena, CA 911051457496770
- Roy Davis, M.D.Pasadena, CA 911051083748198
- Latanya Hines, M.DPasadena, CA 911051194884171
- Sarah KingPasadena, CA 911051386979813
- Kenneth Lam, M.D.Pasadena, CA 911051871620088
Common questions
What is William Robert Dietrick, MD's NPI number?
William Robert Dietrick, MD's National Provider Identifier (NPI) is 1881712248, issued on Mar 26, 2007. An NPI identifies a provider in billing; it is not a license.
Where is William Robert Dietrick, MD located?
The NPPES record lists a practice address at 800 Fairmount Ave, Pasadena, CA, 91105. Phone: (626) 397-5126. Providers update this record themselves, so call before visiting.
How can I verify William Robert Dietrick, MD's license?
NPPES lists California license number G13777, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
What is William Robert Dietrick, MD's MIPS final score?
The 2023 MIPS final score is 76.6 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.