PAM GREWALL M.D.
NPI 1578580445
Hospitalist in San Francisco, CA
About Pam Grewall M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
PAM GREWALL M.D. (NPI 1578580445) is an individual hospitalist provider in San Francisco, California, licensed in California (A78443) and active in the NPI registry since July 2006. She is enrolled in Medicare PECOS and is a graduate of New York College Of Osteo Medicine Of New York Institute Of Technology (2000).
NPPES Registry Identity
Specialties & Licenses 2
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
Pam Grewall 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 Reassignments
4Medicare enrollment records show Pam Grewall 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 94109
- Reassigned Medicare billing, California enrollment
- 962 clinicians in this Medicare group
Palo Alto, CA 94306
- Reassigned Medicare billing, California enrollment
- Also billed through NPI 1043354020 (California), NPI 1629301346 (California)
- 2,460 clinicians in this Medicare group
Apple Valley, CA 92307
- Reassigned Medicare billing, California enrollment
- 914 clinicians in this Medicare group
San Bernardino, CA 92404
- Reassigned Medicare billing, California enrollment
- 1,216 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 94115 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 3
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
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.
SAN FRANCISCO, CA 94115
SAN FRANCISCO, CA 94115
SAN FRANCISCO, CA 94115
SAN FRANCISCO, CA 94115
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 Pam Grewall's NPI number?
The NPI number for Pam Grewall is 1578580445. It was assigned to this individual provider in the NPPES registry on July 16, 2006.
Where is Pam Grewall located?
Pam Grewall practices at 2340 Clay St 2nd Floor, San Francisco, CA 94115. The listed phone number is (415) 600-3458.
What is Pam Grewall's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Pam Grewall enrolled in Medicare?
Yes. Pam Grewall 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 Pam Grewall's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Pam Grewall reassigns Medicare benefits to 4 organizations: Galen Inpatient Physicians Inc (San Francisco, CA), County Of Santa Clara (Palo Alto, CA), Hospitalist Medicine Physicians Of California, Inc (Apple Valley, CA) and Inpatient Specialists Of California, PC (San Bernardino, 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 Pam Grewall'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 Pam Grewall was last updated on May 7, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.
# Pam Grewall, M.D. · NPI 1578580445
Hospitalist physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since July 16, 2006.
## Identity
- **NPI:** 1578580445 (Entity type: Individual)
- **Enumerated:** July 16, 2006
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** A78443 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2340 CLAY ST, 2ND FLOOR, San Francisco, CA 94115-1932
- **Phone:** (415) 600-3458 · **Fax:** (415) 600-3451
## 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): Galen Inpatient Physicians Inc (NPI 1730313933, San Francisco, CA); County Of Santa Clara (NPI 1285228080, Palo Alto, CA); Hospitalist Medicine Physicians Of California, Inc (NPI 1184663965, Apple Valley, CA); Inpatient Specialists Of California, PC (NPI 1952792475, San Bernardino, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** New York College Of Osteo Medicine Of New York Institute Of Technology, class of 2000
## Record status
- **NPPES last updated:** May 7, 2019
- **Other identifiers:** Medicaid 00A784430 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1578580445) · Data from the CMS NPPES public registry.