MARTHA KENYON NICHOLSON MD
NPI 1578637880
Hospitalist in Valhalla, NY
About Martha Kenyon Nicholson Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARTHA KENYON NICHOLSON MD (NPI 1578637880) is an individual hospitalist provider in Valhalla, New York, licensed in New York (336971) and active in the NPI registry since November 2006. She is enrolled in Medicare PECOS and is a graduate of University Of California, Davis School Of Medicine (1996).
NPPES Registry Identity
Specialties & Licenses 3
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 (PECOS)
Martha Kenyon Nicholson Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
7Medicare enrollment records show Martha Nicholson reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Hawthorne, NY 10532
- Reassigned Medicare billing, New York enrollment
- 511 clinicians in this Medicare group
White Plains, NY 10605
- Reassigned Medicare billing, New York enrollment
- Medicare enrollment name: Weill Medical College Of Cornell
- 980 clinicians in this Medicare group
Stamford, CT 06907
- Reassigned Medicare billing, Connecticut enrollment
- 496 clinicians in this Medicare group
Philadelphia, PA 19107
- Reassigned Medicare billing, Delaware enrollment
- 526 clinicians in this Medicare group
Stockton, CA 95210
- Reassigned Medicare billing, California enrollment
- 20,078 clinicians in this Medicare group
Pleasanton, CA 94588
- Reassigned Medicare billing, California enrollment
- 4,258 clinicians in this Medicare group
Palo Alto, CA 94304
- Reassigned Medicare billing, California enrollment
- 3,617 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 10595 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.
VALHALLA, NY 10595
VALHALLA, NY 10595
VALHALLA, NY 10595
VALHALLA, NY 10595
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 Martha Nicholson's NPI number?
The NPI number for Martha Nicholson is 1578637880. It was assigned to this individual provider in the NPPES registry on November 20, 2006.
Where is Martha Nicholson located?
Martha Nicholson practices at 100 Woods Rd, Valhalla, NY 10595. The listed phone number is (914) 493-7000.
What is Martha Nicholson's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Martha Nicholson enrolled in Medicare?
Yes. Martha Nicholson is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Martha Nicholson's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Martha Nicholson reassigns Medicare benefits to 7 organizations: Boston Children's Health Physicians, LLP (Hawthorne, NY), Weill Medical College Of Cornell Univ. (White Plains, NY), Stamford Health Medical Group Inc (Stamford, CT), The Nemours Foundation (Philadelphia, PA), Permanente Medical Group Inc (Stockton, CA) and 2 more organizations, listed in the Medicare section above. 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 Martha Nicholson'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 Martha Nicholson was last updated on September 4, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 51 days 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.
# Martha Kenyon Nicholson, MD · NPI 1578637880
Hospitalist physician in Valhalla, New York. Individual provider, active in the CMS NPPES registry since November 20, 2006.
## Identity
- **NPI:** 1578637880 (Entity type: Individual)
- **Enumerated:** November 20, 2006
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** 336971 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 100 WOODS RD, Valhalla, NY 10595-1530
- **Phone:** (914) 493-7000
## 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:** 7 organizations under Medicare reassignment (form CMS-855R): Boston Children's Health Physicians, LLP (NPI 1467454967, Hawthorne, NY); Weill Medical College Of Cornell Univ. (NPI 1427165489, White Plains, NY); Stamford Health Medical Group Inc (NPI 1154633980, Stamford, CT); The Nemours Foundation (NPI 1902959653, Philadelphia, PA); Permanente Medical Group Inc (NPI 1548343510, Stockton, CA); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, Davis School Of Medicine, class of 1996
## Record status
- **NPPES last updated:** September 4, 2026
- **Other identifiers:** Medicaid 00A633200 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1578637880) · Data from the CMS NPPES public registry.