Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Rebecca F Connor, M.D.

Internal Medicine Physician in Waltham, MA · enumerated 2007.

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

National Provider Identifier

1598880379

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Registry record

Entity type Individual (Type 1)

Name Rebecca F Connor

Credential M.D.

Sex Female

Practice address 95 Sawyer Rd, Uptodate, Inc, Waltham, MA, 02453

Phone (781) 392-2957

Fax (781) 642-8867

Enumeration date Mar 20, 2007

Last updated in NPPES Sep 8, 2009

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 230562 (MA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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

Is NPI 1598880379 active?

Yes, as of the latest NPPES snapshot, NPI 1598880379 is active (record last updated 2009-09-08).

How do I verify Rebecca Connor's NPI record?

Cross-check NPI 1598880379 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

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Denise Basow Internal Medicine Physician · Waltham, MA NPI 1609883255

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-09-08.