Mark Diaz, PA-C, MS, MPH
NPI 1164942116 · Physician Assistant · Davis, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Diaz, PA-C, MS, MPH is a Physician Assistant provider in Davis, CA (NPI 1164942116).
Provider details
- NPI number
- 1164942116
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C, MS, MPH
- Sex
- Male
- Sole proprietor
- No
- License
- 54564 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
9 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
190 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 84 | $82 |
| Aspiration And/Or Injection of Fluid From Large Joint20610 | 62 | $62 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 27 | $100 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 17 | $115 |
Typical Medicare-allowed amounts for these services range $62–$115 (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 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ondansetronbrand: Ondansetron Odt | 79 | 71 |
| Oxycodone Hcl/Acetaminophenbrand: Oxycodone-Acetaminophen | 69 | 42 |
| Oxycodone Hcl | 28 | 26 |
| Meloxicam | 19 | 17 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 18 | 15 |
| Ketorolac Tromethamine | 15 | 15 |
| Naloxone Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2017-06-21
- Last updated
- 2017-07-03
Frequently asked questions
- What is Mark Diaz's NPI number?
- Mark Diaz's National Provider Identifier (NPI) is 1164942116, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Diaz's specialty?
- Mark Diaz is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mark Diaz located?
- Mark Diaz's practice location on file with NPPES is 2020 Sutter Pl Ste 104, Davis, CA 95616-6217.
- What is Mark Diaz's phone number?
- The practice phone number listed in the NPPES registry for Mark Diaz is (530) 750-5900.
- Does Mark Diaz accept Medicare?
- Mark Diaz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Diaz's NPI active?
- Yes — Mark Diaz's NPI (1164942116) is active in the NPPES registry as of the last update on 2017-07-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.