DR. DANIEL AHN D.O.
NPI 1932416781
Ophthalmology in Sonoma, CA
About Dr. Daniel Ahn D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. DANIEL AHN D.O. (NPI 1932416781) is an individual ophthalmology provider in Sonoma, California, licensed in California (20A12253) and active in the NPI registry since August 2010. He is enrolled in Medicare PECOS, is affiliated with St Luke's Cornwall Hospital, and is a graduate of New York College Of Osteo Medicine Of New York Institute Of Technology (2008).
NPPES Registry Identity
Specialties & Licenses
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
Dr. Daniel Ahn D.o. 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 Daniel Ahn reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Goshen, NY 10924
- Reassigned Medicare billing, New York enrollment
- Medicare enrollment name: Horizon Medical Group PC
- 98 clinicians in this Medicare group
Cornwall, NY 12518
- Reassigned Medicare billing, New York enrollment
- 19 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.
Areas of Expertise CMS Part B claims 20
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
St Luke's Cornwall Hospital
Acute Care Hospitals · Newburgh, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 95476 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.
SONOMA, CA 95476
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 Daniel Ahn's NPI number?
The NPI number for Daniel Ahn is 1932416781. It was assigned to this individual provider in the NPPES registry on August 31, 2010.
Where is Daniel Ahn located?
Daniel Ahn practices at 181 Andrieux St Suite 100, Sonoma, CA 95476. The listed phone number is (707) 588-7939.
What is Daniel Ahn's specialty?
The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.
Is Daniel Ahn enrolled in Medicare?
Yes. Daniel Ahn 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 Daniel Ahn's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Daniel Ahn reassigns Medicare benefits to 2 organizations: Horizon Medical Group, P.C. (Goshen, NY) and Eastern Orange Ambulatory Surgery Center, LLC (Cornwall, NY). 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 Daniel Ahn's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Daniel Ahn affiliated with any hospitals?
According to CMS data, Daniel Ahn is affiliated with St Luke's Cornwall Hospital.
When was this NPI record last updated?
The NPPES record for Daniel Ahn was last updated on July 31, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 years 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.
# Dr. Daniel Ahn, D.O. · NPI 1932416781
Ophthalmology physician in Sonoma, California. Individual provider, active in the CMS NPPES registry since August 31, 2010.
## Identity
- **NPI:** 1932416781 (Entity type: Individual)
- **Enumerated:** August 31, 2010
- **Primary specialty:** Ophthalmology · taxonomy 207W00000X
- **State license:** 20A12253 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 181 ANDRIEUX ST, SUITE 100, Sonoma, CA 95476-6932
- **Phone:** (707) 588-7939 · **Fax:** (707) 588-7941
## 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): Horizon Medical Group, P.C. (NPI 1063488179, Goshen, NY); Eastern Orange Ambulatory Surgery Center, LLC (NPI 1568583896, Cornwall, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** New York College Of Osteo Medicine Of New York Institute Of Technology, class of 2008
## Record status
- **NPPES last updated:** July 31, 2012
---
Source: [NPI Profile](https://npiprofile.com/npi/1932416781) · Data from the CMS NPPES public registry.