Active NPI
Mark A. Halsey, MD
- Dermatology Physician
- Sag Harbor, NY
National Provider Identifier
1790070480
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Dermatology Physician
- License
- 282033
- Practice address
- 3350 Noyac Rd
Sag Harbor, NY 11963-1908 - Phone
- (631) 731-1099
- NPI assigned
- Jun 10, 2011
- Sex
- Male
- Sole proprietor
- Yes
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Specialties & licenses 3
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Pediatric Dermatology Physician | 207NP0225X | 282033 | NY | |
| Procedural Dermatology Physician | 207NS0135X | 282033 | NY | |
| Dermatology Physician | 207N00000X | 282033 | NY | Primary |
Addresses
Primary practice location
3350 Noyac Rd
Sag Harbor, NY 11963-1908
Mailing address
3350 Noyac Rd
Sag Harbor, NY 11963-1908
Phone (631) 731-1099
Other identifiers 1
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 05078079 | Medicaid | NY |
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Enrolled in NY
- Eligible to order & refer
- Part B services: Yes
- Medical equipment: Yes
- Home health: Yes
- Power mobility devices: Yes
- Hospice: Yes
Enrollment records 1
Care Compare profile
Medicare Care Compare- Specialty
- Dermatology
- Education
- University of South Florida College of Medicine, 2011
- Medicare assignment
- Accepts the Medicare-approved amount as payment in full
- Group practices
Practice addresses (Care Compare)
3350 Noyac Rd
Sag Harbor, NY 11963-1908
Phone (631) 731-1099
Hospital & facility affiliations
Merit-based Incentive Payment System (MIPS)
- Final score
- 100 of 100
- Quality
- 100
- Improvement activities
- 40
Procedures performed for Medicare patients
| Procedure | Number of procedures |
|---|---|
| Melanoma (skin cancer) excision | 33 |
| Removal of skin lesions | 1123 |
| Skin biopsy | 627 |
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
- Credentials
- Doctor of Medicine
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Sagaponack Medical PC | Current | Accepting new patients |
Locations
686 County Road 39A
Southampton, NY 11968
Phone (631) 283-0355
Networks
- Healthfirst Medicare Network H3359
- Healthfirst Medicare Network H9678
- Healthfirst Medicare Network H1722
- Healthfirst Medicare Network H5989
Interoperability endpoints
- mhalsey676431@nychhc.direct-ci.com
- eaccount133845@nyumc.direct-ci.com
Organizations & group practices 1
Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.
-
- Medical Specialty Clinic/Center
- Sag Harbor, NY
- NPI 1407351646
Hospital & facility affiliations 6
Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.
-
- General Acute Care Hospital
- Southampton, NY
- NPI 1033224704
-
- General Acute Care Hospital
- Southampton, NY
- NPI 1225507114
-
- General Acute Care Hospital
- Greenport, NY
- NPI 1881690691
-
- General Acute Care Hospital
- Stony Brook, NY
- NPI 1972523348
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1307664000000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1754352000000",
"number": "1790070480",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "3350 NOYAC RD",
"city": "SAG HARBOR",
"state": "NY",
"postal_code": "119631908",
"telephone_number": "631-731-1099",
"fax_number": "631-994-3196"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "3350 NOYAC RD",
"city": "SAG HARBOR",
"state": "NY",
"postal_code": "119631908",
"telephone_number": "631-731-1099"
}
],
"practiceLocations": [],
"basic": {
"last_name": "HALSEY",
"first_name": "MARK",
"middle_name": "A.",
"credential": "MD",
"sole_proprietor": "YES",
"sex": "M",
"enumeration_date": "2011-06-10",
"last_updated": "2025-08-05",
"certification_date": "2025-08-05",
"status": "A"
},
"taxonomies": [
{
"code": "207NP0225X",
"taxonomy_group": "",
"desc": "Dermatology, Pediatric Dermatology",
"state": "NY",
"license": "282033",
"primary": false
},
{
"code": "207NS0135X",
"taxonomy_group": "",
"desc": "Dermatology, Procedural Dermatology",
"state": "NY",
"license": "282033",
"primary": false
},
{
"code": "207N00000X",
"taxonomy_group": "",
"desc": "Dermatology",
"state": "NY",
"license": "282033",
"primary": true
}
],
"identifiers": [
{
"code": "05",
"desc": "MEDICAID",
"issuer": null,
"identifier": "05078079",
"state": "NY"
}
],
"endpoints": [],
"other_names": []
}Other providers in Sag Harbor, NY
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 5, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
- Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.