NPI Portal NPI Lookup & Verification

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

Dr. Howard Mark Heller, MD

Internal Medicine Physician in Cambridge, MA · enumerated 2005 · practices at Massachusetts Institute of Technology.

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

National Provider Identifier

1508856287

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Registry record

Entity type Individual (Type 1)
Name Dr. Howard Mark Heller
Credential MD
Sex Male
Practice address Cambridge, MA, 02139
Phone (617) 253-1615
Fax (617) 258-0437
Enumeration date Oct 25, 2005
Last updated in NPPES Oct 11, 2011

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

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 74425 (MA) Primary
207RI0200X Infectious Disease Physician Allopathic & Osteopathic Physicians · License 74425 (MA) 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
3080935 Medicaid MA -
J11283 Other MA BCBS MA
074425 Other MA TUFTS HEALTH PLAN

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 Howard Heller?
Howard Heller 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-10-11.