Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Alina Mastan, M.D.

Internal Medicine Physician in New York, NY · enumerated 2005.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1285620245

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. Alina Mastan

Credential M.D.

Sex Female

Practice address New York, NY, 10010

Phone (212) 228-4600

Fax (212) 260-8391

Enumeration date Sep 26, 2005

Last updated in NPPES Jun 18, 2018

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 242761 (NY) Secondary

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 25MA7120300 (NJ) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 242762 (NY) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
03304749	Medicaid	NY	-

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Alina Mastan?

Alina Mastan is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

Browse all →

Adel Batri Ophthalmology Physician · New York, NY NPI 1952397614 Michael Heublum Neurology Physician · New York, NY NPI 1336168954 R. Christine Melton Ophthalmology Physician · New York, NY NPI 1780769463 Hossain Awini Cardiovascular Disease Physician · New York, NY NPI 1033282165 Alan Sickles Surgery Physician · New York, NY NPI 1134292527 Gladys Diaz Clinical Social Worker · New York, NY NPI 1417024506 Lee Shechtman Hematology & Oncology Physician · New York, NY NPI 1669524237 Richard Hirschman Hematology & Oncology Physician · New York, NY NPI 1669524674

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-06-18.