Justin Williams, M.D.
NPI 1578511846 · Emergency Medicine Physician · Fort Sam Houston, TX
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Justin Williams, M.D. is a Emergency Medicine Physician provider in Fort Sam Houston, TX (NPI 1578511846).
Provider details
- NPI number
- 1578511846
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 35085855 (OH)
Specialties & taxonomies
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
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
606 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 | 349 | $177 |
| Critical Care, First 30-74 Minutes99291 | 131 | $214 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 126 | $122 |
Typical Medicare-allowed amounts for these services range $122–$214 (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 |
|---|---|---|
| Ondansetronbrand: Ondansetron Odt | 110 | 109 |
| Ibuprofen | 59 | 59 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 49 | 49 |
| Prednisone | 40 | 40 |
| Cyclobenzaprine Hcl | 27 | 27 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 21 | 21 |
| Cephalexin |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$51 across 3 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
Registry dates
- Enumerated
- 2006-05-05
- Last updated
- 2007-11-08
Frequently asked questions
- What is Justin Williams's NPI number?
- Justin Williams's National Provider Identifier (NPI) is 1578511846, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Justin Williams's specialty?
- Justin Williams is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Justin Williams located?
- Justin Williams's practice location on file with NPPES is 3851 Roger Brooke Dr, Fort Sam Houston, TX 78234-4501.
- What is Justin Williams's phone number?
- The practice phone number listed in the NPPES registry for Justin Williams is (210) 916-0808.
- Does Justin Williams accept Medicare?
- Justin Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Justin Williams's NPI active?
- Yes — Justin Williams's NPI (1578511846) is active in the NPPES registry as of the last update on 2007-11-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.