Lynn Chang, MD
NPI 1598843187 · Surgery Physician · Redwood City, CA
Enrolled with Medicare as Practitioner - General Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Lynn Chang, MD is a Surgery Physician provider in Redwood City, CA (NPI 1598843187).
Provider details
- NPI number
- 1598843187
- Entity type
- Individual
- Primary specialty
- Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A62936 (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
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 · 3 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ibuprofen | 41 | 40 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 28 | 26 |
| Oxycodone Hcl | 17 | 17 |
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
- 2006-11-01
- Last updated
- 2021-12-20
Frequently asked questions
- What is Lynn Chang's NPI number?
- Lynn Chang's National Provider Identifier (NPI) is 1598843187, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Lynn Chang's specialty?
- Lynn Chang is listed in the NPPES registry with a primary specialty of Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Lynn Chang located?
- Lynn Chang's practice location on file with NPPES is 1150 Veterans Blvd, Redwood City, CA 94063-2037.
- What is Lynn Chang's phone number?
- The practice phone number listed in the NPPES registry for Lynn Chang is (650) 299-2000.
- Does Lynn Chang accept Medicare?
- Lynn Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Lynn Chang's NPI active?
- Yes — Lynn Chang's NPI (1598843187) is active in the NPPES registry as of the last update on 2021-12-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.