Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. John S Sullivan, MD
Allergy Physician in Worcester, MA · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1568466324
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Registry record
Entity type Individual (Type 1)
Name Dr. John S Sullivan
Credential MD
Sex Male
Practice address 100 Mlk Jr Blvd, 2nd Floor, Worcester, MA, 01608
Phone (508) 757-1589
Fax (508) 756-5633
Enumeration date Jun 9, 2005
Last updated in NPPES Sep 3, 2008
Taxonomy & licenses
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 |
|---|---|---|---|
| 0200248 | Other | MA | UNITED HEALTH CARE |
| 057446 | Other | MA | TUFTS HEALTHPLAN |
| J30252 | Other | MA | BLUE CROSS BLUE SHIELD |
| 985163 | Other | MA | NETWORK HEALTH |
| 6189768 | Medicaid | MA | - |
| 042923137 | Other | MA | TAX ID GROUP NUMBER |
| 645387 | Other | MA | HARVARD PILGRIM |
| 2376607 | Other | MA | AETNA HEALTHCARE |
| 26920 | Other | MA | CHILDREN'S MEDICAL SECURI |
| 63777 | Other | MA | FALLON HEALTH PLAN |
| 0029830 | Other | MA | NEIGHBORHOOD HEALTH PLAN |
| 326051 | Other | MA | CIGNA HEALTHCARE |
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
What is the NPI number for John Sullivan?
The National Provider Identifier (NPI) for John Sullivan is 1568466324, a Type 1 (individual) record in the CMS NPPES registry.
Where does John Sullivan practice?
The practice location on file with NPPES is in Worcester, MA. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Lawrence Pincus Allergy Physician · Worcester, MA NPI 1720082662 Central Mass Allergy & Asthma Care Allergy Physician · Worcester, MA NPI 1093708927 Diane Pingeton Obstetrics & Gynecology Physician · Worcester, MA NPI 1629029574 Elizabeth Kopin Gynecology Physician · Worcester, MA NPI 1245282417 Quest Diagnostics Massachusetts LLC Clinical Medical Laboratory · Worcester, MA NPI 1295753242 Robert Gedachian Allergy Physician · Worcester, MA NPI 1144324716 Yelena Kisel Family Nurse Practitioner · Worcester, MA NPI 1619201654 Patricia Siano Nurse Practitioner · Worcester, MA NPI 1225471220
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-09-03.