DR. HORATIO HOLZER M.D.
NPI 1790050110
Hospitalist in New York, NY
About Dr. Horatio Holzer M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. HORATIO HOLZER M.D. (NPI 1790050110) is an individual hospitalist provider in New York, New York, licensed in New York (278882) and active in the NPI registry since March 2012. He is enrolled in Medicare PECOS, is affiliated with Mount Sinai Hospital, and is a graduate of Other (2012).
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 and accepts Medicare assignment
Dr. Horatio Holzer M.d. 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 Horatio Holzer reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
New York, NY 10029
- Reassigned Medicare billing, New York enrollment
- 769 clinicians in this Medicare group
New York, NY 10065
- Reassigned Medicare billing, New York enrollment
- 315 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 3
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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mount Sinai Hospital
Acute Care Hospitals · New York, NYMount Sinai St Luke's Roosevelt Hospital
Acute Care Hospitals · New York, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 10029 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.
NEW YORK, NY 10029
NEW YORK, NY 10029
NEW YORK, NY 10029
NEW YORK, NY 10029
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 Horatio Holzer's NPI number?
The NPI number for Horatio Holzer is 1790050110. It was assigned to this individual provider in the NPPES registry on March 19, 2012.
Where is Horatio Holzer located?
Horatio Holzer practices at 1 Gustave L Levy Pl, New York, NY 10029. The listed phone number is (212) 241-1653.
What is Horatio Holzer's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Horatio Holzer enrolled in Medicare?
Yes. Horatio Holzer 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 Horatio Holzer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Horatio Holzer reassigns Medicare benefits to 2 organizations: Icahn School Of Medicine At Mount Sinai (New York, NY) and Memorial Medical Consultation Group (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 Horatio Holzer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Horatio Holzer affiliated with any hospitals?
According to CMS data, Horatio Holzer is affiliated with Mount Sinai Hospital and Mount Sinai St Luke's Roosevelt Hospital.
When was this NPI record last updated?
The NPPES record for Horatio Holzer was last updated on April 12, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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. Horatio Holzer, M.D. · NPI 1790050110
Hospitalist physician in New York, New York. Individual provider, active in the CMS NPPES registry since March 19, 2012.
## Identity
- **NPI:** 1790050110 (Entity type: Individual)
- **Enumerated:** March 19, 2012
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** 278882 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 1 GUSTAVE L LEVY PL, New York, NY 10029-6504
- **Phone:** (212) 241-1653 · **Fax:** (212) 289-6393
## 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): Icahn School Of Medicine At Mount Sinai (NPI 1659639524, New York, NY); Memorial Medical Consultation Group (NPI 1053382523, New York, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2012
## Record status
- **NPPES last updated:** April 12, 2016
---
Source: [NPI Profile](https://npiprofile.com/npi/1790050110) · Data from the CMS NPPES public registry.