HARTWELL N LIN M.D.
NPI 1366463507
Emergency Medicine in San Rafael, CA
About Hartwell N Lin M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
HARTWELL N LIN M.D. (NPI 1366463507) is an individual emergency medicine provider in San Rafael, California, licensed in California (A65114) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in Concord, and is a graduate of Albany Medical College Of Union University (1995).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Hartwell N Lin M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Hartwell Lin reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Greenbrae, CA 94904
- Reassigned Medicare billing, California enrollment
- 2,323 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 4
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94903 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 6
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAN RAFAEL, CA 94903
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Hartwell Lin's NPI number?
The NPI number for Hartwell Lin is 1366463507. It was assigned to this individual provider in the NPPES registry on July 22, 2006.
Where is Hartwell Lin located?
Hartwell Lin practices at 4000 Civic Center Dr Ste 206, San Rafael, CA 94903. The listed phone number is (415) 925-8865.
What is Hartwell Lin's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Hartwell Lin enrolled in Medicare?
Yes. Hartwell Lin is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Hartwell Lin's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Hartwell Lin reassigns Medicare benefits to Cep America - California (Greenbrae, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Hartwell Lin's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Hartwell Lin was last updated on October 14, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Hartwell N Lin, M.D. · NPI 1366463507
Emergency Medicine physician in San Rafael, California. Individual provider, active in the CMS NPPES registry since July 22, 2006.
## Identity
- **NPI:** 1366463507 (Entity type: Individual)
- **Enumerated:** July 22, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A65114 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 4000 CIVIC CENTER DR STE 206, San Rafael, CA 94903-5233
- **Phone:** (415) 925-8865
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Cep America - California (NPI 1417975319, Greenbrae, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Albany Medical College Of Union University, class of 1995
## Record status
- **NPPES last updated:** October 14, 2026
- **Other identifiers:** Medicaid 00A651140 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1366463507) · Data from the CMS NPPES public registry.