Matthew Fisher, M.D.
NPI 1891038964 · Internal Medicine Physician · Stony Brook, NY
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Matthew Fisher, M.D. is a Internal Medicine Physician provider in Stony Brook, NY (NPI 1891038964).
Provider details
- NPI number
- 1891038964
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 295801 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
13 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
328 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) |
|---|---|---|
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 264 | $145 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 33 | $88 |
| Initial Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99221 | 31 | $94 |
Typical Medicare-allowed amounts for these services range $88–$145 (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 (1)
- 400 E Main StMount Kisco, NY 10549-3417Phone: (914) 666-1200
Registry dates
- Enumerated
- 2013-03-27
- Last updated
- 2024-01-13
- Certified
- 2024-01-13
Frequently asked questions
- What is Matthew Fisher's NPI number?
- Matthew Fisher's National Provider Identifier (NPI) is 1891038964, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Matthew Fisher's specialty?
- Matthew Fisher is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Matthew Fisher located?
- Matthew Fisher's practice location on file with NPPES is Stony Brook University Hospital, Stony Brook, NY 11794-8111.
- What is Matthew Fisher's phone number?
- The practice phone number listed in the NPPES registry for Matthew Fisher is (631) 444-2020.
- Does Matthew Fisher accept Medicare?
- Matthew Fisher is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Matthew Fisher's NPI active?
- Yes — Matthew Fisher's NPI (1891038964) is active in the NPPES registry as of the last update on 2024-01-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.