DR. MICHAEL CARL LARSEN MD
NPI 1962685222
Internal Medicine - Gastroenterology in Seattle, WA
About Dr. Michael Carl Larsen Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MICHAEL CARL LARSEN MD (NPI 1962685222) is an individual gastroenterology provider in Seattle, Washington, licensed in Washington (MD60295858) and active in the NPI registry since December 2007. He is enrolled in Medicare PECOS and is a graduate of Columbia University College Of Physicians And Surgeons (2005).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 7
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
Dr. Michael Carl Larsen Md 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 Reassignments
4Medicare enrollment records show Michael Larsen reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 2,112 clinicians in this Medicare group
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 clinicians in this Medicare group
Burlingame, CA 94010
- Reassigned Medicare billing, California enrollment
- 23 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 13
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 98101 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Michael Larsen's NPI number?
The NPI number for Michael Larsen is 1962685222. It was assigned to this individual provider in the NPPES registry on December 10, 2007.
Where is Michael Larsen located?
Michael Larsen practices at 1100 9th Ave, Seattle, WA 98101. The listed phone number is (206) 223-2319.
What is Michael Larsen's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Michael Larsen enrolled in Medicare?
Yes. Michael Larsen 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 organizations bill Medicare for Michael Larsen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Michael Larsen reassigns Medicare benefits to 4 organizations: Regents Of The University Of California (San Francisco, CA), Ucsf Medical Group Business Services (San Francisco, CA), University Of California San Francisco (San Francisco, CA) and University Of California San Francisco (Burlingame, CA). Each 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 Michael Larsen'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 Michael Larsen was last updated on June 18, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 years 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.
# Dr. Michael Carl Larsen, MD · NPI 1962685222
Gastroenterology physician in Seattle, Washington. Individual provider, active in the CMS NPPES registry since December 10, 2007.
## Identity
- **NPI:** 1962685222 (Entity type: Individual)
- **Enumerated:** December 10, 2007
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **State license:** MD60295858 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 1100 9TH AVE, Seattle, WA 98101-2756
- **Phone:** (206) 223-2319 · **Fax:** (206) 223-6379
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Regents Of The University Of California (NPI 1235322348, San Francisco, CA); Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA); University Of California San Francisco (NPI 1164512851, San Francisco, CA); University Of California San Francisco (NPI 1861208399, Burlingame, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Columbia University College Of Physicians And Surgeons, class of 2005
## Record status
- **NPPES last updated:** June 18, 2013
- **Other identifiers:** Medicare PIN 8912205 (WA); Other MD00307 (AK); Other 1962685222 (WA); and 4 more
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Source: [NPI Profile](https://npiprofile.com/npi/1962685222) · Data from the CMS NPPES public registry.