JOHN MAHLSTEDT
NPI 1891172854
Psychiatry & Neurology - Child & Adolescent Psychiatry in White Plains, NY
About John Mahlstedt NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN MAHLSTEDT (NPI 1891172854) is an individual child & adolescent psychiatry provider in White Plains, New York, licensed in New York (285554-1) and active in the NPI registry since April 2015. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
John Mahlstedt is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show John Mahlstedt reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
White Plains, NY 10605
- Reassigned Medicare billing, New York enrollment
- Medicare enrollment name: The New York And Presbyterian Hospital
- 174 clinicians in this Medicare group
New York, NY 10065
- Reassigned Medicare billing, New York enrollment
- 172 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.
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.
WHITE PLAINS, NY 10605
WHITE PLAINS, NY 10605
WHITE PLAINS, NY 10605
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 John Mahlstedt's NPI number?
The NPI number for John Mahlstedt is 1891172854. It was assigned to this individual provider in the NPPES registry on April 29, 2015.
Where is John Mahlstedt located?
John Mahlstedt practices at 21 Bloomingdale Rd, White Plains, NY 10605. The listed phone number is (914) 997-4875.
What is John Mahlstedt's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Child & Adolescent Psychiatry, with taxonomy code 2084P0804X.
Is John Mahlstedt enrolled in Medicare?
Yes. John Mahlstedt is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for John Mahlstedt's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Mahlstedt reassigns Medicare benefits to 2 organizations: The New York And Presbyterian Hosp (White Plains, NY) and Weill Medical College Of Cornell (New York, NY). 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 John Mahlstedt'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 John Mahlstedt was last updated on December 17, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# John Mahlstedt · NPI 1891172854
Child & Adolescent Psychiatry physician in White Plains, New York. Individual provider, active in the CMS NPPES registry since April 29, 2015.
## Identity
- **NPI:** 1891172854 (Entity type: Individual)
- **Enumerated:** April 29, 2015
- **Primary specialty:** Psychiatry & Neurology - Child & Adolescent Psychiatry · taxonomy 2084P0804X
- **State license:** 285554-1 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 21 BLOOMINGDALE RD, White Plains, NY 10605-1504
- **Phone:** (914) 997-4875
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): The New York And Presbyterian Hosp (NPI 1063683068, White Plains, NY); Weill Medical College Of Cornell (NPI 1871692210, New York, NY) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** December 17, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1891172854) · Data from the CMS NPPES public registry.