Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Karl F Liebermann, D.O.

Addiction Medicine (Preventive Medicine) Physician in Northborough, MA · enumerated 2006 · practices at Acorn Health Services, PC.

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

National Provider Identifier

1346353687

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. Karl F Liebermann

Credential D.O.

Sex Male

Practice address 112 Main St Ste 104, Northborough, MA, 01532

Phone (508) 691-6086

Fax (508) 691-6089

Enumeration date Aug 17, 2006

Last updated in NPPES Feb 9, 2025

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 249400 (MA) Secondary

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 1858 (ME) Secondary

207QA0401X Addiction Medicine (Family Medicine) Physician Allopathic & Osteopathic Physicians · License 249400 (MA) Secondary

2083A0300X Addiction Medicine (Preventive Medicine) Physician Allopathic & Osteopathic Physicians · License 249400 (MA) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier	Type	State	Issuer
5996726002	Other	-	CIGNA
432373499	Medicaid	ME	-
4218213	Other	-	AETNA HMO
AA3544	Other	-	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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Karl Liebermann practice?

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

What is the NPI number for Karl Liebermann?

The National Provider Identifier (NPI) for Karl Liebermann is 1346353687, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Acorn Health Services, PC Primary Care Clinic/Center · Northborough, MA NPI 1477073138

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-02-09.