Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Hanno P. Muellner, MD

Internal Medicine Physician in Williamsburg, MA · enumerated 2006.

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

National Provider Identifier

1548220684

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Registry record

Entity type Individual (Type 1)

Name Hanno P. Muellner

Credential MD

Sex Male

Practice address 14 Williams St, Williamsburg, MA, 01096

Phone (413) 268-3616

Fax (413) 268-0337

Enumeration date Mar 24, 2006

Last updated in NPPES Oct 25, 2011

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 155543 (MA) 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
3705721007	Other	MA	CIGNA
000000008322	Other	MA	BMC
04-3194547	Other	MA	PHCS
04-3194547	Other	MA	NORTH AMERICAN PREFERRED
04-3194547	Other	MA	NORTHEAST HEALTHCARE ALLI
04-3194547	Other	MA	UNITED HEALTHCARE
04-3194547	Other	MA	GREAT-WEST
04-3194547	Other	MA	UNICARE/GIC
155543	Other	MA	TUFTS
21839	Other	MA	HNE
23584116	Other	MA	AETNA
J18375	Other	MA	BCBSMA
04-3194547	Other	MA	NORTHEAST HEALTH DIRECT
3173887	Medicaid	MA	-
66797	Other	MA	HARVARD PILGRIM
04-3194547	Other	MA	CONSOLIDATED
04-3194547	Other	MA	PLAN VISTA
155543	Other	MA	CONNECTICARE

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

What is the NPI number for Hanno Muellner?

The National Provider Identifier (NPI) for Hanno Muellner is 1548220684, a Type 1 (individual) record in the CMS NPPES registry.

Where does Hanno Muellner practice?

The practice location on file with NPPES is in Williamsburg, MA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Peter Siersma Internal Medicine Physician · Williamsburg, MA NPI 1730148149 Sarah Fletcher Adult Health Nurse Practitioner · Williamsburg, MA NPI 1255575791 Joanna Pheasant Adult Health Nurse Practitioner · Williamsburg, MA NPI 1427470996

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-10-25.