NORTHWEST GERIATRICS
NPI 1497706774
Internal Medicine - Geriatric Medicine in Mercer Island, WA
About Northwest Geriatrics NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
NORTHWEST GERIATRICS (NPI 1497706774) is a healthcare organization registered as a geriatric medicine in Mercer Island, Washington and active in the NPI registry since May 2006. The organization holds a CLIA Waiver certificate valid through April 4, 2028 and lists John H. Addison, Owner, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Other Identifiers 2
Group Practice 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Northwest Geriatrics is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
21Medicare enrollment records show 21 clinicians reassign Medicare billing to Northwest Geriatrics, which bills Medicare for the services they deliver. Of these, 4 practice at this address and 16 within 10 miles. Listed here are the 20 practicing nearest to this location.
Clinicians by Medicare Specialty 5
Nearest to this location (20)
See all 21Mount Vernon, WA 98274
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
CLIA Laboratory Certificates CMS CLIA
Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.
Certificate of Waiver 50D2157122
Northwest Geriatrics · Mercer Island, WAFrequently 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 John H. Addison MD Ps's NPI number?
The NPI number for John H. Addison MD Ps is 1497706774. It was assigned to this organization in the NPPES registry on May 12, 2006. The provider is doing business as Northwest Geriatrics.
Where is John H. Addison MD Ps located?
John H. Addison MD Ps is located at 9725 SE 36th St. Suite 214, Mercer Island, WA 98040. The listed phone number is (206) 275-3588.
What is John H. Addison MD Ps's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Geriatric Medicine, with taxonomy code 207RG0300X.
Is John H. Addison MD Ps enrolled in Medicare?
Yes. John H. Addison MD Ps is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through John H. Addison MD Ps?
According to the CMS Revalidation Reassignment List (October 2026 release), 21 clinicians in 5 Medicare specialties reassign their Medicare billing to John H. Addison MD Ps. A 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 the clinician's services. The largest specialties are Nurse Practitioner (13), Internal Medicine (3) and General Practice (2). Of these, 4 practice at this address and 16 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Does John H. Addison MD Ps hold a CLIA laboratory certificate?
Yes. A Certificate of Waiver (number 50D2157122) is associated with this NPI, valid through April 4, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
What insurance does John H. Addison MD Ps accept?
Health plans from Premera Blue Cross Blue Shield of Alaska list John H. Addison MD Ps as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for John H. Addison MD Ps was last updated on January 5, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.
# Northwest Geriatrics · NPI 1497706774
Geriatric Medicine organization in Mercer Island, Washington. Organization record, active in the CMS NPPES registry since May 12, 2006.
## Identity
- **NPI:** 1497706774 (Entity type: Organization)
- **Enumerated:** May 12, 2006
- **Primary specialty:** Internal Medicine - Geriatric Medicine · taxonomy 207RG0300X
- **Legal business name:** John H. Addison Md Ps
- **Organization subpart:** No
- **Authorized official:** John Addison, OWNER
## Practice location
- **Address:** 9725 SE 36TH ST., SUITE 214, Mercer Island, WA 98040
- **Phone:** (206) 275-3588 · **Fax:** (206) 275-2073
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 21 clinicians in 5 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Nurse Practitioner (13), Internal Medicine (3), General Practice (2); 4 practice at this address and 16 within 10 miles; [full list](https://npiprofile.com/npi/1497706774/clinicians) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** January 5, 2017
- **Other identifiers:** Medicare UPIN AB33253 (WA); Medicare ID-Type Unspecified GAB33253 (WA)
- **CLIA laboratory certificates:** 1 on file
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Source: [NPI Profile](https://npiprofile.com/npi/1497706774) · Data from the CMS NPPES public registry.