Mark Diaz, PA-C
NPI 1700370020 · Physician Assistant · Madison, WI
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Diaz, PA-C is a Physician Assistant provider in Madison, WI (NPI 1700370020).
Provider details
- NPI number
- 1700370020
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Male
- Sole proprietor
- No
- License
- 4404-23 (WI)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
8 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
394 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 142 | $136 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 115 | $94 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 78 | $6 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 38 | $55 |
| Critical Care, First 30-74 Minutes99291 | 21 | $166 |
Typical Medicare-allowed amounts for these services range $6–$166 (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 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Cephalexin | 26 | 26 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 21 | 20 |
| Ondansetronbrand: Ondansetron Odt | 20 | 20 |
| Cefdinir | 14 | 13 |
| Doxycycline Hyclate | 13 | 13 |
| Prednisone | 12 | 12 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$109 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2018-06-20
- Last updated
- 2018-06-20
Frequently asked questions
- What is Mark Diaz's NPI number?
- Mark Diaz's National Provider Identifier (NPI) is 1700370020, 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 77 S Oakbridge Ct Apt 105, Madison, WI 53717-2030.
- What is Mark Diaz's phone number?
- The practice phone number listed in the NPPES registry for Mark Diaz is (562) 659-3459.
- 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 (1700370020) is active in the NPPES registry as of the last update on 2018-06-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.