William Guthrie, MD
Addiction Medicine (Family Medicine) Physician · Loma Linda, CA
William Guthrie, MD is an addiction medicine (family medicine) physician with a practice address in Loma Linda, California, and NPI 1588127344, issued on Apr 9, 2019. Check the license (California A176986, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- William Guthrie
- Credential
- MD
- Primary taxonomy
- Addiction Medicine (Family Medicine) Physician 207QA0401X
- License number
- A176986 CA
Self-reported in NPPES; status is on the state search - Practice location
- 25333 Barton RD, Loma Linda, CA 92350
- Phone
- (909) 558-6641
- Enumerated
- Apr 9, 2019
- Record last updated
- Aug 31, 2023
- Medicare enrollment
- Enrolled (PECOS I20220929002225); accepts Medicare assignment
- Medical or professional school
- Loma Linda University School Of Medicine, 2019
- Entity
- Type 1 · individual
8 nearest addiction medicine (family medicine) physician records → All 124 in California → Look up another NPI →
Also registered at 25333 Barton RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Mickey Lui, D.O.Physical Medicine & Rehabilitation Physician1518371384
Verify William Guthrie in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A176986Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average addiction medicine (family medicine) physician in 2024
40 Medicare Part D claims for 18 beneficiaries, against an average of 664 among the 581 providers of this specialty who prescribed in Part D.
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): 85.2 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).
Bills Medicare through 2 group practices
- Faculty Physicians And Surgeons OF LlusmLoma Linda, CA
- Sac Health SystemSan Bernardino, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Guthrie among 124 addiction medicine (family medicine) physician records in California
William Guthrie, MD is one of 124 addiction medicine (family medicine) physician records with a practice address in California. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 75% of them.
- NPI issued2019 · 75% of these records are older, 16% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 52% of these records are
- Graduated2019 · median 2015 among the 64 with a school on file
- Record last updated2023 · 33% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207QA0401X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Addiction Medicine (Family Medicine) Physician providers in California
There are 124 addiction medicine (family medicine) physician records in California.
All 124 in California → Every provider in Loma Linda → Addiction Medicine (Family Medicine) Physician nationwide →
The 8 addiction medicine (family medicine) physician records with the nearest ZIP codes
- Samantha AyoubLoma Linda, CA 923501346701174
- Ling Fung KongLoma Linda, CA 923501619615234
- Daniel RistakianLoma Linda, CA 923501699415398
- Mitchell Schoen, M.D.Loma Linda, CA 923501659802767
- Joshua Siu, DOLoma Linda, CA 923501689369332
- Marianne Aldridge, M.D.Loma Linda, CA 923541336311000
- Sridevi KorandLoma Linda, CA 923541700345709
- Peter Lang, DOLoma Linda, CA 923541811550940
Common questions
What is William Guthrie, MD's NPI number?
William Guthrie, MD's National Provider Identifier (NPI) is 1588127344, issued on Apr 9, 2019. An NPI identifies a provider in billing; it is not a license.
Where is William Guthrie, MD located?
The NPPES record lists a practice address at 25333 Barton RD, Loma Linda, CA, 92350. Phone: (909) 558-6641. Providers update this record themselves, so call before visiting.
How can I verify William Guthrie, MD's license?
NPPES lists California license number A176986, 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 William Guthrie, MD prescribe under Medicare Part D?
In 2024, William Guthrie, MD had 40 Medicare Part D claims for 18 beneficiaries; the average among addiction medicine (family medicine) physician prescribers was 664. Part D covers Medicare prescriptions only.
What is William Guthrie, MD's MIPS final score?
The 2023 MIPS final score is 85.2 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.