Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Karen E Klein, M.D.

Pediatrics Physician in Boston, MA · enumerated 2006.

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

National Provider Identifier

1154309235

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Karen E Klein

Credential M.D.

Sex Female

Practice address 165 Dartmouth St, Boston, MA, 02116

Phone (617) 859-5470

Fax (617) 859-5059

Enumeration date Jan 9, 2006

Last updated in NPPES Oct 28, 2020

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 45931 (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
0015148	Other	MA	NEIGHBORHOOD HEALTH
045931	Other	MA	TUFTS
PP364	Other	MA	HARVARD PILGRIM
E05814	Other	MA	BLUE CROSS
0166464	Medicaid	MA	-

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 1154309235 active?

Yes, as of the latest NPPES snapshot, NPI 1154309235 is active (record last updated 2020-10-28).

How do I verify Karen Klein's NPI record?

Cross-check NPI 1154309235 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

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-10-28.