Ryan Williams, M.D.
NPI 1043621600 · Pediatric Cardiology Physician · Boston, MA
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ryan Williams, M.D. is a Pediatric Cardiology Physician provider in Boston, MA (NPI 1043621600).
Provider details
- NPI number
- 1043621600
- Entity type
- Individual
- Primary specialty
- Pediatric Cardiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 270773 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
12 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 1 distinct drug on file.
| Drug | Part D claims (2024) |
|---|---|
| Warfarin Sodium | 13 |
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 no Part D record, 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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2014-05-16
- Last updated
- 2023-02-06
- Certified
- 2023-02-06
Frequently asked questions
- What is Ryan Williams's NPI number?
- Ryan Williams's National Provider Identifier (NPI) is 1043621600, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ryan Williams's specialty?
- Ryan Williams is listed in the NPPES registry with a primary specialty of Pediatric Cardiology Physician (Allopathic & Osteopathic Physicians).
- Where is Ryan Williams located?
- Ryan Williams's practice location on file with NPPES is 300 Longwood Ave, Boston, MA 02115-5724.
- What is Ryan Williams's phone number?
- The practice phone number listed in the NPPES registry for Ryan Williams is (617) 355-6000.
- Does Ryan Williams accept Medicare?
- Ryan Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ryan Williams's NPI active?
- Yes — Ryan Williams's NPI (1043621600) is active in the NPPES registry as of the last update on 2023-02-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.