SIDNEY H ALLISON MD
NPI 1275893752
Internal Medicine in Seattle, WA
About Sidney H Allison Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SIDNEY H ALLISON MD (NPI 1275893752) is an individual internal medicine provider in Seattle, Washington, licensed in Washington (MD60476243) and active in the NPI registry since May 2012. She is enrolled in Medicare PECOS, is affiliated with Swedish Medical Center / Cherry Hill, and is a graduate of Other (2012).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Sidney H Allison Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
15Medicare enrollment records show Sidney Allison reassigns Medicare billing to 15 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Seattle, WA 98104
- Reassigned Medicare billing, Washington enrollment
- 1,270 clinicians in this Medicare group
Renton, WA 98055
- Reassigned Medicare billing, Washington enrollment
- 689 clinicians in this Medicare group
Redding, CA 96001
- Reassigned Medicare billing, California enrollment
- 962 clinicians in this Medicare group
Vallejo, CA 94589
- Reassigned Medicare billing, California enrollment
- 20,078 clinicians in this Medicare group
San Francisco, CA 94133
- Reassigned Medicare billing, California enrollment
- 1,573 clinicians in this Medicare group
San Francisco, CA 94133
- Reassigned Medicare billing, California enrollment
- 40 clinicians in this Medicare group
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
San Francisco, CA 94110
- Reassigned Medicare billing, California enrollment
- 637 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.
Hospital Affiliations CMS Care Compare 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Swedish Medical Center / Cherry Hill
Acute Care Hospitals · Seattle, WASwedish Medical Center
Acute Care Hospitals · Seattle, WAValley Medical Center
Acute Care Hospitals · Renton, WASwedish Issaquah
Acute Care Hospitals · Issaquah, WAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 98122 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.
Reported Quality Measures
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.
SEATTLE, WA 98122
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 Sidney Allison's NPI number?
The NPI number for Sidney Allison is 1275893752. It was assigned to this individual provider in the NPPES registry on May 18, 2012.
Where is Sidney Allison located?
Sidney Allison practices at 747 Broadway, Seattle, WA 98122. The listed phone number is (206) 215-2520.
What is Sidney Allison's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Sidney Allison enrolled in Medicare?
Yes. Sidney Allison is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Sidney Allison's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Sidney Allison reassigns Medicare benefits to 15 organizations: Swedish Health Services (Seattle, WA), Valley Medical Group-Renton (Renton, WA), Galen Inpatient Physicians PC (Redding, CA), Permanente Medical Group Inc (Vallejo, CA), City & County Of San Francisco (San Francisco, CA) and 10 more organizations, listed in the Medicare section above. 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 Sidney Allison's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Sidney Allison accept?
Health plans from Blue Cross and Blue Shield of Texas, CareSource, Premera Blue Cross Blue Shield of Alaska and Providence Health Plan list Sidney Allison 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.
Is Sidney Allison affiliated with any hospitals?
According to CMS data, Sidney Allison is affiliated with Swedish Medical Center / Cherry Hill, Swedish Medical Center, Valley Medical Center and Swedish Issaquah.
When was this NPI record last updated?
The NPPES record for Sidney Allison was last updated on February 10, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 months 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.
# Sidney H Allison, MD · NPI 1275893752
Internal Medicine physician in Seattle, Washington. Individual provider, active in the CMS NPPES registry since May 18, 2012.
## Identity
- **NPI:** 1275893752 (Entity type: Individual)
- **Enumerated:** May 18, 2012
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** MD60476243 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 747 BROADWAY, Seattle, WA 98122-4379
- **Phone:** (206) 215-2520 · **Fax:** (206) 386-3180
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 15 organizations under Medicare reassignment (form CMS-855R): Swedish Health Services (NPI 1689612954, Seattle, WA); Valley Medical Group-Renton (NPI 1619209574, Renton, WA); Galen Inpatient Physicians PC (NPI 1649141532, Redding, CA); Permanente Medical Group Inc (NPI 1336222397, Vallejo, CA); City & County Of San Francisco (NPI 1023579356, San Francisco, CA); and 10 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2012
## Record status
- **NPPES last updated:** February 10, 2026
- **Other identifiers:** Medicaid 2029080 (WA)
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Source: [NPI Profile](https://npiprofile.com/npi/1275893752) · Data from the CMS NPPES public registry.