MALLAR BHATTACHARYA MD
NPI 1063558757
Internal Medicine - Critical Care Medicine in San Francisco, CA
About Mallar Bhattacharya Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MALLAR BHATTACHARYA MD (NPI 1063558757) is an individual critical care medicine provider in San Francisco, California, licensed in California (A98985) and active in the NPI registry since January 2007. He is enrolled in Medicare PECOS and is a graduate of Harvard Medical School (2004).
NPPES Registry Identity
Specialties & Licenses
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
Mallar Bhattacharya 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
3Medicare enrollment records show Mallar Bhattacharya reassigns Medicare billing to 3 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 94143
- Reassigned Medicare billing, California enrollment
- 723 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 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 2
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 94143 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.
SAN FRANCISCO, CA 94143
SAN FRANCISCO, CA 94143
SAN FRANCISCO, CA 94143
SAN FRANCISCO, CA 94143
SAN FRANCISCO, CA 94143
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 Mallar Bhattacharya's NPI number?
The NPI number for Mallar Bhattacharya is 1063558757. It was assigned to this individual provider in the NPPES registry on January 29, 2007.
Where is Mallar Bhattacharya located?
Mallar Bhattacharya practices at 505 Parnassus Ave, San Francisco, CA 94143. The listed phone number is (415) 476-6926.
What is Mallar Bhattacharya's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is Mallar Bhattacharya enrolled in Medicare?
Yes. Mallar Bhattacharya 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 Mallar Bhattacharya's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mallar Bhattacharya reassigns Medicare benefits to 3 organizations: Regents Of The University Of California (San Francisco, CA), University Anesthesia Medical Group (San Francisco, CA) and University Of California San Francisco (San Francisco, 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 Mallar Bhattacharya'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 Mallar Bhattacharya was last updated on August 16, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.
# Mallar Bhattacharya, MD · NPI 1063558757
Critical Care Medicine physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since January 29, 2007.
## Identity
- **NPI:** 1063558757 (Entity type: Individual)
- **Enumerated:** January 29, 2007
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** A98985 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 505 PARNASSUS AVE, San Francisco, CA 94143-2204
- **Phone:** (415) 476-6926
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Regents Of The University Of California (NPI 1376613943, San Francisco, CA); University Anesthesia Medical Group (NPI 1528137296, San Francisco, CA); University Of California San Francisco (NPI 1346329380, San Francisco, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Harvard Medical School, class of 2004
## Record status
- **NPPES last updated:** August 16, 2016
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Source: [NPI Profile](https://npiprofile.com/npi/1063558757) · Data from the CMS NPPES public registry.