DR. APARNA BALA SUNDARAM MD
NPI 1871756288
Internal Medicine - Critical Care Medicine in San Francisco, CA
About Dr. Aparna Bala Sundaram Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. APARNA BALA SUNDARAM MD (NPI 1871756288) is an individual critical care medicine provider in San Francisco, California, licensed in California (A108543) and active in the NPI registry since July 2008. She is enrolled in Medicare PECOS and is a graduate of Northwestern University Feinberg Medical School (2006).
NPPES Registry Identity
Specialties & Licenses 3
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
Dr. Aparna Bala Sundaram 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
4Medicare enrollment records show Aparna Sundaram 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 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
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 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
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.
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 Aparna Sundaram's NPI number?
The NPI number for Aparna Sundaram is 1871756288. It was assigned to this individual provider in the NPPES registry on July 7, 2008.
Where is Aparna Sundaram located?
Aparna Sundaram practices at 1550 4th Street Rm 545, Box 2922, San Francisco, CA 94143. The listed phone number is (415) 514-4275.
What is Aparna Sundaram's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is Aparna Sundaram enrolled in Medicare?
Yes. Aparna Sundaram 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 Aparna Sundaram's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Aparna Sundaram reassigns Medicare benefits to 4 organizations: Regents Of The University Of California (San Francisco, CA), University Anesthesia Medical Group (San Francisco, CA), University Of California San Francisco (San Francisco, CA) and Ucsf Medical Group Business Services (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 Aparna Sundaram'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 Aparna Sundaram was last updated on January 11, 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.
# Dr. Aparna Bala Sundaram, MD · NPI 1871756288
Critical Care Medicine physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since July 7, 2008.
## Identity
- **NPI:** 1871756288 (Entity type: Individual)
- **Enumerated:** July 7, 2008
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** A108543 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1550 4TH STREET, RM 545, BOX 2922, San Francisco, CA 94143
- **Phone:** (415) 514-4275
## 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): Regents Of The University Of California (NPI 1235322348, San Francisco, CA); University Anesthesia Medical Group (NPI 1528137296, San Francisco, CA); University Of California San Francisco (NPI 1346329380, San Francisco, CA); Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Northwestern University Feinberg Medical School, class of 2006
## Record status
- **NPPES last updated:** January 11, 2017
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Source: [NPI Profile](https://npiprofile.com/npi/1871756288) · Data from the CMS NPPES public registry.