NPI Portal NPI Lookup & Verification

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

Aaron Lee Haag, DO

Internal Medicine Physician in Hershey, PA · enumerated 2019.

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

National Provider Identifier

1669934600

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Aaron Lee Haag
Credential DO
Sex Male
Practice address Hershey, PA, 17033
Phone (800) 243-1455
Enumeration date Apr 1, 2019
Last updated in NPPES Jun 23, 2026

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 OS022136 (PA) 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

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

What is the NPI number for Aaron Haag?
The National Provider Identifier (NPI) for Aaron Haag is 1669934600, a Type 1 (individual) record in the CMS NPPES registry.
Where does Aaron Haag practice?
The practice location on file with NPPES is in Hershey, PA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-06-23.