DR. UDAY KUMAR MUKHERJEE MD
NPI 1659457075
Psychiatry & Neurology - Psychiatry in Walnut Creek, CA
About Dr. Uday Kumar Mukherjee Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. UDAY KUMAR MUKHERJEE MD (NPI 1659457075) is an individual psychiatry provider in Walnut Creek, California, licensed in California (A081816) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in Modesto, and is a graduate of Other (1991).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 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
Dr. Uday Kumar Mukherjee 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
2Medicare enrollment records show Uday Mukherjee reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Walnut Creek, CA 94597
- Reassigned Medicare billing, California enrollment
- 149 clinicians in this Medicare group
Martinez, CA 94553
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Hiawatha Harris MD Inc.
- 26 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 5
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 94597 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.
WALNUT CREEK, CA 94597
WALNUT CREEK, CA 94597
WALNUT CREEK, CA 94597
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 Uday Mukherjee's NPI number?
The NPI number for Uday Mukherjee is 1659457075. It was assigned to this individual provider in the NPPES registry on October 27, 2006.
Where is Uday Mukherjee located?
Uday Mukherjee practices at 3100 Oak Rd Ste 270, Walnut Creek, CA 94597. The listed phone number is (925) 944-9711.
What is Uday Mukherjee's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.
Is Uday Mukherjee enrolled in Medicare?
Yes. Uday Mukherjee 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 Uday Mukherjee's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Uday Mukherjee reassigns Medicare benefits to 2 organizations: Comprehensive Psychiatric Services, A Medical Group (Walnut Creek, CA) and Hiawatha Harris, Corporation (Martinez, 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 Uday Mukherjee'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 Uday Mukherjee was last updated on May 6, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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. Uday Kumar Mukherjee, MD · NPI 1659457075
Psychiatry physician in Walnut Creek, California. Individual provider, active in the CMS NPPES registry since October 27, 2006.
## Identity
- **NPI:** 1659457075 (Entity type: Individual)
- **Enumerated:** October 27, 2006
- **Primary specialty:** Psychiatry & Neurology - Psychiatry · taxonomy 2084P0800X
- **State license:** A081816 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 3100 OAK RD STE 270, Walnut Creek, CA 94597-2078
- **Phone:** (925) 944-9711 · **Fax:** (925) 944-9709
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Comprehensive Psychiatric Services, A Medical Group (NPI 1184785834, Walnut Creek, CA); Hiawatha Harris, Corporation (NPI 1407063936, Martinez, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1991
## Record status
- **NPPES last updated:** May 6, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1659457075) · Data from the CMS NPPES public registry.