NPPES file of Aug 9, 2026

Parker Andrew Duncan Diaz, MD, MPH, FAAFP

Addiction Medicine (Family Medicine) Physician · Santa Rosa, CA

Parker Andrew Duncan Diaz, MD, MPH, FAAFP is an addiction medicine (family medicine) physician with a practice address in Santa Rosa, California, and NPI 1033434923, issued on Apr 2, 2010. Check the license (California A118268, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1033434923
Name
Parker Andrew Duncan Diaz
Credential
MD, MPH, FAAFP
Primary taxonomy
Addiction Medicine (Family Medicine) Physician 207QA0401X
License number
A118268 CA
Self-reported in NPPES; status is on the state search
Practice location
751 Lombardi CT, Santa Rosa, CA 95407
Phone
(707) 547-2222
Enumerated
Apr 2, 2010
Record last updated
Oct 18, 2023
Fax
(707) 547-2229
Medicare enrollment
Enrolled (PECOS I20240503001420); accepts Medicare assignment
Medical or professional school
University Of California, Irvine, California College Of Medicine, 2010
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest addiction medicine (family medicine) physician records → All 124 in California → Look up another NPI →

Also registered at 751 Lombardi CT

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Selena Aguilar NunezProfessional Counselor1215811799
  2. Nancy Allen, FNPFamily Nurse Practitioner1053341354
  3. Vanessa Aspericueta, FNPFamily Nurse Practitioner1851722763
  4. Paul Atkinson, D.D.S., PH.DGeneral Practice Dentistry1043277940
  5. Kimberly Balmorez, NPNurse Practitioner1457167256
  6. Krystal Bodily, FNPFamily Nurse Practitioner1912463407

Verify Parker Andrew Duncan Diaz in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A118268    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

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2.2 times the Medicare Part D claims of the average addiction medicine (family medicine) physician in 2024

1,485 Medicare Part D claims for 105 beneficiaries, against an average of 664 among the 581 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 93 claims were for opioids.

  1. Parker Duncan Diaz1,485
  2. Specialty average664

Most prescribed

  1. Atorvastatin Calcium105 claims
  2. Metformin Hcl89 claims
  3. Jardiance63 claims
  4. Hydrocodone-Acetaminophen62 claims
  5. Omeprazole52 claims
  6. Trazodone Hcl46 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.

Bills Medicare through one group practice

  1. Santa Rosa Community Health CentersSanta Rosa, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Parker Andrew Duncan Diaz among 124 addiction medicine (family medicine) physician records in California

Parker Andrew Duncan Diaz, MD, MPH, FAAFP 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 2010, is newer than 43% of them.

  • NPI issued2010 · 43% of these records are older, 52% newer
  • In a Medicare fileYes · 78% of these records are
  • In the CMS Doctors and Clinicians fileYes · 52% of these records are
  • Graduated2010 · 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 Santa Rosa → Addiction Medicine (Family Medicine) Physician nationwide →

The 8 addiction medicine (family medicine) physician records with the nearest ZIP codes

  1. Elyse Eisenberg, M.D.Santa Rosa, CA 954051316966815
  2. Myles Ketchum, M.D., PH.D.Santa Rosa, CA 954031093249864
  3. Stephen Bradley, MDLakeport, CA 954531699746446
  4. Robert GardnerLucerne, CA 954581023183829
  5. Susan Nylen, NFPManteca, CA 953361205823077
  6. Cara Eberhardt, MDUkiah, CA 954821174151450
  7. Andrea Silva, MDCeres, CA 953071942792007
  8. Eva Smith, M.D., M.P.H.Hoopa, CA 955461982773099

Common questions

What is Parker Andrew Duncan Diaz, MD, MPH, FAAFP's NPI number?

Parker Andrew Duncan Diaz, MD, MPH, FAAFP's National Provider Identifier (NPI) is 1033434923, issued on Apr 2, 2010. An NPI identifies a provider in billing; it is not a license.

Where is Parker Andrew Duncan Diaz, MD, MPH, FAAFP located?

The NPPES record lists a practice address at 751 Lombardi CT, Santa Rosa, CA, 95407. Phone: (707) 547-2222. Providers update this record themselves, so call before visiting.

How can I verify Parker Andrew Duncan Diaz, MD, MPH, FAAFP's license?

NPPES lists California license number A118268, 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 Parker Andrew Duncan Diaz, MD, MPH, FAAFP prescribe under Medicare Part D?

In 2024, Parker Andrew Duncan Diaz, MD, MPH, FAAFP had 1,485 Medicare Part D claims for 105 beneficiaries; the average among addiction medicine (family medicine) physician prescribers was 664. Part D covers Medicare prescriptions only.

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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.