Stephen Lyon, P.A.
NPI 1477007573 · Physician Assistant · San Diego, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Lyon, P.A. is a Physician Assistant provider in San Diego, CA (NPI 1477007573).
Provider details
- NPI number
- 1477007573
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- P.A.
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
- Surgical Physician Assistant363AS0400X
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
9 yrs in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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) | Beneficiaries |
|---|---|---|
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 13 | 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
Additional practice locations (1)
- 400 N Pepper AveColton, CA 92324-1801Phone: (909) 580-3390
Registry dates
- Enumerated
- 2016-08-08
- Last updated
- 2021-12-08
Frequently asked questions
- What is Stephen Lyon's NPI number?
- Stephen Lyon's National Provider Identifier (NPI) is 1477007573, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Lyon's specialty?
- Stephen Lyon is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Stephen Lyon located?
- Stephen Lyon's practice location on file with NPPES is 4647 Zion Ave, San Diego, CA 92120-2507.
- What is Stephen Lyon's phone number?
- The practice phone number listed in the NPPES registry for Stephen Lyon is (619) 528-5000.
- Does Stephen Lyon accept Medicare?
- Stephen Lyon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Lyon's NPI active?
- Yes — Stephen Lyon's NPI (1477007573) is active in the NPPES registry as of the last update on 2021-12-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.