JONATHAN HIMMELFARB (M.D.) – Nephrology Physician, NPI 1275533903
Nephrology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
279 NEPHROLOGY in WA
Provider Addresses for JONATHAN HIMMELFARB (M.D.)
PO BOX 50095
SEATTLE, WA 981455095
Phone: (206) 543-6420
Type: Mailing
325 9th Ave
Seattle, WA 981042420
Phone: (206) 744-8998
Fax: (207) 761-4433
Type: Location
1 GUSTAVE L LEVY PL
NEW YORK, NY 100296504
Phone: (212) 987-7208
Type: Location
Harborview Medical Center, 325, 9th Avenue, Little Saigon, First Hill, Seattle, King County, Washington, 98104, United States
SEATTLE, WA 981042420
Phone: (206) 744-8998
Fax: (207) 761-4433
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2024-11-12
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20241112001640 | I | Nephrology | NY | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
No Medicare fee-for-service utilization data available for this provider in our database.
Insurance plans in this area (ZIP 98145)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| NEPHROLOGY | WA | 90935 | Hemodialysis procedure with one physician evaluation | 53 | 28 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| - | NY | |
| P S Y C H I A T R Y | NY | |
| E N D O C R I N O L O G Y | FL | |
| - | NY | |
| Internal Medicine, Gastroenterology | NY | |
| - | NY | |
| P S Y C H I A T R Y | NY | |
| Critical Care (Intensivists), Internal Medicine, Pulmonary Disease | NY | |
| Physician Assistant | NY | |
| P S Y C H I A T R Y | NY |
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