Yvonne Oseiwe-Williams, MD
NPI 1538301676 · Emergency Medicine Physician · Baltimore, MD
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Yvonne Oseiwe-Williams, MD is a Emergency Medicine Physician provider in Baltimore, MD (NPI 1538301676).
Provider details
- NPI number
- 1538301676
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 25MA09510400 (NJ)
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 tenure28% of score
17 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
619 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) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 453 | $179 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 136 | $123 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 30 | $73 |
Typical Medicare-allowed amounts for these services range $73–$179 (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 | 32 | 32 |
| Oxycodone Hcl/Acetaminophenbrand: Oxycodone-Acetaminophen | 31 | 30 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 26 | 26 |
| Cefdinir | 13 | 13 |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 13 | 13 |
| Methylprednisolone | 11 | — |
| Oxycodone Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-04-06
- Last updated
- 2021-06-16
- Certified
- 2021-06-16
Frequently asked questions
- What is Yvonne Oseiwe-Williams's NPI number?
- Yvonne Oseiwe-Williams's National Provider Identifier (NPI) is 1538301676, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Yvonne Oseiwe-Williams's specialty?
- Yvonne Oseiwe-Williams is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Yvonne Oseiwe-Williams located?
- Yvonne Oseiwe-Williams's practice location on file with NPPES is 20 First Light Ct, Baltimore, MD 21237-2166.
- What is Yvonne Oseiwe-Williams's phone number?
- The practice phone number listed in the NPPES registry for Yvonne Oseiwe-Williams is (443) 742-4516.
- Does Yvonne Oseiwe-Williams accept Medicare?
- Yvonne Oseiwe-Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Yvonne Oseiwe-Williams's NPI active?
- Yes — Yvonne Oseiwe-Williams's NPI (1538301676) is active in the NPPES registry as of the last update on 2021-06-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.