Rex Hermansen, M.D.
NPI 1639532039 · Hospitalist Physician · New York, NY
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Rex Hermansen, M.D. is a Hospitalist Physician provider in New York, NY (NPI 1639532039).
Provider details
- NPI number
- 1639532039
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 296964 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
10 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
774 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 371 | $129 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 279 | $86 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 68 | $123 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 56 | $186 |
Typical Medicare-allowed amounts for these services range $86–$186 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Additional practice locations (2)
- 622 W 168th StNew York, NY 10032-3720Phone: (212) 305-6262
- 622 W 168th StNew York, NY 10032-3720Phone: (212) 305-6262
Registry dates
- Enumerated
- 2016-04-01
- Last updated
- 2019-03-21
Frequently asked questions
- What is Rex Hermansen's NPI number?
- Rex Hermansen's National Provider Identifier (NPI) is 1639532039, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Rex Hermansen's specialty?
- Rex Hermansen is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Rex Hermansen located?
- Rex Hermansen's practice location on file with NPPES is 1 Gustave L Levy Pl, New York, NY 10029.
- What is Rex Hermansen's phone number?
- The practice phone number listed in the NPPES registry for Rex Hermansen is (212) 241-1653.
- Does Rex Hermansen accept Medicare?
- Rex Hermansen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Rex Hermansen's NPI active?
- Yes — Rex Hermansen's NPI (1639532039) is active in the NPPES registry as of the last update on 2019-03-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.