Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Aaron Steven Geller, MD

Pain Medicine Physician in Nashua, NH · enumerated 2006.

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

National Provider Identifier

1831128479

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Registry record

Entity type Individual (Type 1)

Name Aaron Steven Geller

Credential MD

Sex Male

Practice address 154 Broad St, Nashua, NH, 03063

Phone (603) 882-9872

Fax (603) 465-7829

Enumeration date Jul 3, 2006

Last updated in NPPES Sep 17, 2020

Taxonomy & licenses

208VP0000X Pain Medicine Physician Allopathic & Osteopathic Physicians · License 10423 (NH) 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
359075	Other	NH	TUFTS
433740	Other	NH	CIGNA
125324400	Other	NH	US DEPARTMENT OF LABOR
200385180	Other	NH	TRICARE
30011695	Medicaid	NH	-
0103406Y0NH03	Other	NH	ANTHEM
G03799	Other	NH	HARVARD PILGRIM

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.

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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 Aaron Geller?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-09-17.