Mark Halsey, MD
NPI 1790070480 · Dermatology Physician · Sag Harbor, NY
Enrolled with Medicare as Practitioner - Dermatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Halsey, MD is a Dermatology Physician provider in Sag Harbor, NY (NPI 1790070480).
Provider details
- NPI number
- 1790070480
- Entity type
- Individual
- Primary specialty
- Dermatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 282033 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
15 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
3,857 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) |
|---|---|---|
| Destruction of Precancer Skin Growth, 2-14 Growths17003 | 1,393 | $8 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 647 | $109 |
| Destruction of Precancer Skin Growth, 1 Growth17000 | 492 | $61 |
| Biopsy of Related Skin Growth, First Growth11102 | 323 | $115 |
| Biopsy of Related Skin Growth, Each Additional Growth11103 | 239 | $62 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 17 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ketoconazole | 131 | 85 |
| Minoxidil | 52 | 12 |
| Triamcinolone Acetonide | 50 | 32 |
| Clindamycin Phosphate | 48 | 41 |
| Hydrocortisone | 40 | 35 |
| Clobetasol Propionate | 39 | 25 |
| Mupirocin | 35 | 33 |
| Valacyclovir Hclbrand: Valacyclovir | 34 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-06-10
- Last updated
- 2025-08-05
- Certified
- 2025-08-05
Frequently asked questions
- What is Mark Halsey's NPI number?
- Mark Halsey's National Provider Identifier (NPI) is 1790070480, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Halsey's specialty?
- Mark Halsey is listed in the NPPES registry with a primary specialty of Dermatology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Halsey located?
- Mark Halsey's practice location on file with NPPES is 3350 Noyac Rd, Sag Harbor, NY 11963-1908.
- What is Mark Halsey's phone number?
- The practice phone number listed in the NPPES registry for Mark Halsey is (631) 731-1099.
- Does Mark Halsey accept Medicare?
- Mark Halsey is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Halsey's NPI active?
- Yes — Mark Halsey's NPI (1790070480) is active in the NPPES registry as of the last update on 2025-08-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.