David Lyon, M.D
NPI 1538229638 · Internal Medicine Physician · Modesto, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
David Lyon, M.D is a Internal Medicine Physician provider in Modesto, CA (NPI 1538229638).
Provider details
- NPI number
- 1538229638
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D
- Sex
- Male
- Sole proprietor
- Yes
- License
- A43180 (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
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
3 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.
Practice location
Mailing address
Additional practice locations (2)
- 1116 Alice StModesto, CA 95350-5905Phone: (209) 578-3132Fax: (209) 579-9605
- 1028 Reno AveModesto, CA 95351-1127Phone: (209) 579-1103Fax: (209) 579-9605
Registry dates
- Enumerated
- 2006-12-11
- Last updated
- 2024-08-30
- Certified
- 2024-08-30
Frequently asked questions
- What is David Lyon's NPI number?
- David Lyon's National Provider Identifier (NPI) is 1538229638, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is David Lyon's specialty?
- David Lyon is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is David Lyon located?
- David Lyon's practice location on file with NPPES is 1100 Kansas Ave Ste B, Modesto, CA 95351-1596.
- What is David Lyon's phone number?
- The practice phone number listed in the NPPES registry for David Lyon is (209) 579-1151.
- Does David Lyon accept Medicare?
- David Lyon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is David Lyon's NPI active?
- Yes — David Lyon's NPI (1538229638) is active in the NPPES registry as of the last update on 2024-08-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.