Parker Duncan Diaz, MD, MPH, FAAFP
NPI 1033434923 · Addiction Medicine (Family Medicine) Physician · Santa Rosa, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Parker Duncan Diaz, MD, MPH, FAAFP is a Addiction Medicine (Family Medicine) Physician provider in Santa Rosa, CA (NPI 1033434923).
Provider details
- NPI number
- 1033434923
- Entity type
- Individual
- Primary specialty
- Addiction Medicine (Family Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, MPH, FAAFP
- Sex
- Male
- Sole proprietor
- No
- License
- A118268 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
16 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
14 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 14 | $16 |
Typical Medicare-allowed amounts for these services range $16–$16 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 36 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 105 | 34 |
| Metformin Hcl | 89 | 27 |
| Empagliflozinbrand: Jardiance | 63 | 14 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 62 | — |
| Omeprazole | 52 | 16 |
| Trazodone Hcl | 46 | 11 |
Practice location
Mailing address
Additional practice locations (3)
- 3569 Round Barn CirSanta Rosa, CA 95403Phone: (707) 303-3600Fax: (707) 303-3611
- 625 Steele LnSanta Rosa, CA 95403-3127Phone: (707) 576-1852
- 926 Cherry StSanta Rosa, CA 95404-4209Phone: (707) 867-6533
Registry dates
- Enumerated
- 2010-04-02
- Last updated
- 2023-10-18
- Certified
- 2023-09-21
Frequently asked questions
- What is Parker Duncan Diaz's NPI number?
- Parker Duncan Diaz's National Provider Identifier (NPI) is 1033434923, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Parker Duncan Diaz's specialty?
- Parker Duncan Diaz is listed in the NPPES registry with a primary specialty of Addiction Medicine (Family Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Parker Duncan Diaz located?
- Parker Duncan Diaz's practice location on file with NPPES is 751 Lombardi Ct, Santa Rosa, CA 95407-6798.
- What is Parker Duncan Diaz's phone number?
- The practice phone number listed in the NPPES registry for Parker Duncan Diaz is (707) 547-2222.
- Does Parker Duncan Diaz accept Medicare?
- Parker Duncan Diaz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Parker Duncan Diaz's NPI active?
- Yes — Parker Duncan Diaz's NPI (1033434923) is active in the NPPES registry as of the last update on 2023-10-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.