Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Joan S Sisto, M.D.
Dermatology Physician in York, ME · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1033214077
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Registry record
Entity type Individual (Type 1)
Name Dr. Joan S Sisto
Credential M.D.
Sex Female
Practice address 10 Market Place Dr # 3, York, ME, 03909
Phone (207) 305-1959
Enumeration date Sep 14, 2006
Last updated in NPPES Oct 11, 2024
Taxonomy & licenses
207N00000X Dermatology Physician Allopathic & Osteopathic Physicians · License MD15155 (ME) Secondary
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 |
|---|---|---|---|
| 2454120 | Other | - | AETNA |
| H09161 | Other | - | HARVARD |
| 039185 | Other | ME | ANTHEM MAINE |
| 01Y002300NH01 | Other | NH | ANTHEM NEW HAMPSHIRE |
| P00321023 | Other | NH | RAILROAD MEDICARE |
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.
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 Joan Sisto?
Joan Sisto is registered in NPPES with the primary taxonomy of Dermatology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-10-11.