Francis Williams, M.D.
NPI 1275519449 · Rheumatology Physician · San Antonio, TX
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Francis Williams, M.D. is a Rheumatology Physician provider in San Antonio, TX (NPI 1275519449).
Provider details
- NPI number
- 1275519449
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- J4615 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
61 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 45 | $123 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 16 | $159 |
Typical Medicare-allowed amounts for these services range $123–$159 (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 · 50 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Methotrexate Sodiumbrand: Methotrexate | 583 | 188 |
| Prednisone | 535 | 195 |
| Hydroxychloroquine Sulfate | 447 | 154 |
| Leflunomide | 266 | 112 |
| Sulfasalazinebrand: Sulfasalazine Dr | 239 | 74 |
| Folic Acid | 230 | 93 |
| Adalimumabbrand: Humira(cf) Pen | 208 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$708 across 7 records (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
Additional practice locations (1)
- 4330 Medical Dr Ste 400San Antonio, TX 78229-3324Phone: (210) 732-3668Fax: (210) 732-3338
Registry dates
- Enumerated
- 2005-12-20
- Last updated
- 2024-11-06
- Certified
- 2024-11-06
Frequently asked questions
- What is Francis Williams's NPI number?
- Francis Williams's National Provider Identifier (NPI) is 1275519449, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Francis Williams's specialty?
- Francis Williams is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Francis Williams located?
- Francis Williams's practice location on file with NPPES is 8715 Village Dr Ste 400, San Antonio, TX 78217-5407.
- What is Francis Williams's phone number?
- The practice phone number listed in the NPPES registry for Francis Williams is (210) 732-3668.
- Does Francis Williams accept Medicare?
- Francis Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Francis Williams's NPI active?
- Yes — Francis Williams's NPI (1275519449) is active in the NPPES registry as of the last update on 2024-11-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.