Brett Ley, M.D.
NPI 1538494620 · Pulmonary Disease Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Brett Ley, M.D. is a Pulmonary Disease Physician provider in San Francisco, CA (NPI 1538494620).
Provider details
- NPI number
- 1538494620
- Entity type
- Individual
- Primary specialty
- Pulmonary Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A112254 (CA)
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
16 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 · 16 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Budesonide/Formoterol Fumaratebrand: Breyna | 136 | 60 |
| Pirfenidone | 78 | — |
| Prednisone | 63 | 35 |
| Tiotropium Bromidebrand: Spiriva Respimat | 60 | 27 |
| Nintedanib Esylatebrand: Ofev | 38 | — |
| Ciclesonidebrand: Alvesco | 36 | 17 |
| Mycophenolate Mofetil | 36 | 12 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-10-07
- Last updated
- 2021-12-15
Frequently asked questions
- What is Brett Ley's NPI number?
- Brett Ley's National Provider Identifier (NPI) is 1538494620, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Brett Ley's specialty?
- Brett Ley is listed in the NPPES registry with a primary specialty of Pulmonary Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Brett Ley located?
- Brett Ley's practice location on file with NPPES is 505 Parnassus Ave, San Francisco, CA 94143-2204.
- What is Brett Ley's phone number?
- The practice phone number listed in the NPPES registry for Brett Ley is (415) 476-1528.
- Does Brett Ley accept Medicare?
- Brett Ley is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Brett Ley's NPI active?
- Yes — Brett Ley's NPI (1538494620) is active in the NPPES registry as of the last update on 2021-12-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.