MAXWELL B MERKOW MD
NPI 1194951723
Neurological Surgery in Walnut Creek, CA
About Maxwell B Merkow Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MAXWELL B MERKOW MD (NPI 1194951723) is an individual neurological surgery provider in Walnut Creek, California, licensed in California (A147272) and active in the NPI registry since June 2009. He is enrolled in Medicare PECOS and is a graduate of Columbia University College Of Physicians And Surgeons (2009).
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 (PECOS)
Maxwell B Merkow Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
3Medicare enrollment records show Maxwell Merkow reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Walnut Creek, CA 94598
- Reassigned Medicare billing, California enrollment
- 3 clinicians in this Medicare group
Walnut Creek, CA 94598
- Reassigned Medicare billing, California enrollment
- 810 clinicians in this Medicare group
Walnut Creek, CA 94598
- Reassigned Medicare billing, California enrollment
- 347 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 14
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 94598 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Maxwell Merkow's NPI number?
The NPI number for Maxwell Merkow is 1194951723. It was assigned to this individual provider in the NPPES registry on June 10, 2009.
Where is Maxwell Merkow located?
Maxwell Merkow practices at 130 La Casa Via # 2-210, Walnut Creek, CA 94598. The listed phone number is (925) 309-5155.
What is Maxwell Merkow's specialty?
The primary specialty registered for this NPI is Neurological Surgery with taxonomy code 207T00000X.
Is Maxwell Merkow enrolled in Medicare?
Yes. Maxwell Merkow is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Maxwell Merkow's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Maxwell Merkow reassigns Medicare benefits to 3 organizations: Maxwell B. Merkow MD, A Medical Corporation (Walnut Creek, CA), John Muir Trauma Physicians Billing Service (Walnut Creek, CA) and Bass Medical Group (Walnut Creek, 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 Maxwell Merkow'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 Maxwell Merkow was last updated on February 26, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 months 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.
# Maxwell B Merkow, MD · NPI 1194951723
Neurological Surgery physician in Walnut Creek, California. Individual provider, active in the CMS NPPES registry since June 10, 2009.
## Identity
- **NPI:** 1194951723 (Entity type: Individual)
- **Enumerated:** June 10, 2009
- **Primary specialty:** Neurological Surgery · taxonomy 207T00000X
- **State license:** A147272 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 130 LA CASA VIA # 2-210, Walnut Creek, CA 94598-3045
- **Phone:** (925) 309-5155 · **Fax:** (925) 623-5156
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **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): Maxwell B. Merkow MD, A Medical Corporation (NPI 1598290769, Walnut Creek, CA); John Muir Trauma Physicians Billing Service (NPI 1093864837, Walnut Creek, CA); Bass Medical Group (NPI 1043616600, Walnut Creek, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Columbia University College Of Physicians And Surgeons, class of 2009
## Record status
- **NPPES last updated:** February 26, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1194951723) · Data from the CMS NPPES public registry.