Mark Nadeau, MD
NPI 1821009630 · Family Medicine Physician · San Antonio, TX
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Nadeau, MD is a Family Medicine Physician provider in San Antonio, TX (NPI 1821009630).
Provider details
- NPI number
- 1821009630
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G5422 (TX)
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
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
91 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) |
|---|---|---|
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 40 | $17 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 39 | $98 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 12 | $67 |
Typical Medicare-allowed amounts for these services range $17–$98 (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 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Lisinopril | 43 | 17 |
| Atorvastatin Calcium | 31 | 14 |
| Amlodipine Besylate | 21 | — |
| Fluticasone Propionate | 19 | — |
| Famotidine | 15 | — |
| Metformin Hclbrand: Metformin Hcl Er | 14 | — |
| Gabapentin | 13 |
Practice location
Mailing address
Additional practice locations (1)
- 1831 S General Mcmullen DrSan Antonio, TX 78226-1190Phone: (210) 644-8500
Registry dates
- Enumerated
- 2006-08-10
- Last updated
- 2024-05-29
- Certified
- 2024-05-29
Frequently asked questions
- What is Mark Nadeau's NPI number?
- Mark Nadeau's National Provider Identifier (NPI) is 1821009630, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Nadeau's specialty?
- Mark Nadeau is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Nadeau located?
- Mark Nadeau's practice location on file with NPPES is 7703 Floyd Curl Dr, San Antonio, TX 78229-3901.
- What is Mark Nadeau's phone number?
- The practice phone number listed in the NPPES registry for Mark Nadeau is (210) 257-1400.
- Does Mark Nadeau accept Medicare?
- Mark Nadeau is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Nadeau's NPI active?
- Yes — Mark Nadeau's NPI (1821009630) is active in the NPPES registry as of the last update on 2024-05-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.