AARON LEE HAAG DO
NPI 1669934600
Internal Medicine in Hershey, PA
About Aaron Lee Haag Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
AARON LEE HAAG DO (NPI 1669934600) is an individual internal medicine provider in Hershey, Pennsylvania, licensed in Pennsylvania (OS022136) and active in the NPI registry since April 2019. He is enrolled in Medicare PECOS, is affiliated with Milton S Hershey Medical Center, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Aaron Lee Haag Do is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Aaron Haag reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Hershey, PA 17033
- Reassigned Medicare billing, Pennsylvania enrollment
- 2,216 clinicians in this Medicare group
Ligonier, PA 15658
- Reassigned Medicare billing, Pennsylvania enrollment
- 2,881 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Milton S Hershey Medical Center
Acute Care Hospitals · Hershey, PAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 17033 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
HERSHEY, PA 17033
HERSHEY, PA 17033
HERSHEY, PA 17033
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Aaron Haag's NPI number?
The NPI number for Aaron Haag is 1669934600. It was assigned to this individual provider in the NPPES registry on April 1, 2019.
Where is Aaron Haag located?
Aaron Haag practices at 500 University Dr, Hershey, PA 17033. The listed phone number is (800) 243-1455.
What is Aaron Haag's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Aaron Haag enrolled in Medicare?
Yes. Aaron Haag is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Aaron Haag's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Aaron Haag reassigns Medicare benefits to 2 organizations: The Milton S Hershey Medical Center Physicians Group (Hershey, PA) and Allegheny Clinic (Ligonier, PA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Aaron Haag's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Aaron Haag affiliated with any hospitals?
According to CMS data, Aaron Haag is affiliated with Milton S Hershey Medical Center.
When was this NPI record last updated?
The NPPES record for Aaron Haag was last updated on June 23, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Aaron Lee Haag, DO · NPI 1669934600
Internal Medicine physician in Hershey, Pennsylvania. Individual provider, active in the CMS NPPES registry since April 1, 2019.
## Identity
- **NPI:** 1669934600 (Entity type: Individual)
- **Enumerated:** April 1, 2019
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** OS022136 (Pennsylvania)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 500 UNIVERSITY DR, Hershey, PA 17033-2360
- **Phone:** (800) 243-1455
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): The Milton S Hershey Medical Center Physicians Group (NPI 1710951744, Hershey, PA); Allegheny Clinic (NPI 1063946291, Ligonier, PA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** West Virginia School Of Osteopathic Medicine, class of 2019
## Record status
- **NPPES last updated:** June 23, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1669934600) · Data from the CMS NPPES public registry.