Daniel Ahn, D.O.
Ophthalmology Physician · Sonoma, CA
Daniel Ahn, D.O. is an ophthalmology physician with a practice address in Sonoma, California, and NPI 1932416781, issued on Aug 31, 2010. Check the license (California 20A12253, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Daniel Ahn
- Credential
- D.O.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License numbers
- 20A12253 CA
OT012630 PA
Self-reported in NPPES; status is on the state search - Practice location
- 181 Andrieux St, Sonoma, CA 95476
- Phone
- (707) 588-7939
- Enumerated
- Aug 31, 2010
- Record last updated
- Jul 31, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (707) 588-7941
- Medicare enrollment
- Enrolled (PECOS I20160617001599); accepts Medicare assignment
- Medical or professional school
- New York College Of Osteo Medicine Of New York Institute Of Technology, 2008
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →
Also registered at 181 Andrieux St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Daniel Ahn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A12253Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.6 times the Medicare Part D claims of the average ophthalmology physician in 2024
3,993 Medicare Part D claims for 869 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 49% of claims.
Most prescribed
- Prednisolone Acetate914 claims
- Latanoprost618 claims
- Ketorolac Tromethamine487 claims
- Ofloxacin478 claims
- Xiidra268 claims
- Neomycin-Polymyxin-Dexameth226 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 81 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,634.90
49 payments; by number, the most common kind was food and beverage; the largest payer was Bausch & Lomb Americas Inc. The 13,221 providers of this specialty with any payment received $4,535.02 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Horizon Medical Group PCChester, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Daniel Ahn among 2,899 ophthalmology physician records in California
Daniel Ahn, D.O. is one of 2,899 ophthalmology physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 74% of them.
- NPI issued2010 · 74% of these records are older, 24% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2008 · median 2001 among the 1,907 with a school on file
- Record last updated2012 · 67% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in California
There are 2,899 ophthalmology physician records in California.
All 2,899 in California → Every provider in Sonoma → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Thomas Dixon, MDSonoma, CA 954761558437152
- Mark Schluter, M.D.Sonoma, CA 954761275581126
- Eric Kahle, M.D.Sebastopol, CA 954721578541900
- Jack Mason, MDUkiah, CA 954821245267087
- Geoffrey Rice, M.D.Ukiah, CA 954821194776948
- Aron Sampson, MDUkiah, CA 954821235692823
- Randall Woesner, MDUkiah, CA 954821679569933
- Stephen Tanaka, M.D.Union City, CA 954871790863553
Common questions
What is Daniel Ahn, D.O.'s NPI number?
Daniel Ahn, D.O.'s National Provider Identifier (NPI) is 1932416781, issued on Aug 31, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Daniel Ahn, D.O. located?
The NPPES record lists a practice address at 181 Andrieux St, Sonoma, CA, 95476. Phone: (707) 588-7939. Providers update this record themselves, so call before visiting.
How can I verify Daniel Ahn, D.O.'s license?
NPPES lists California license number 20A12253, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Daniel Ahn, D.O. prescribe under Medicare Part D?
In 2024, Daniel Ahn, D.O. had 3,993 Medicare Part D claims for 869 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
What is Daniel Ahn, D.O.'s MIPS final score?
The 2023 MIPS final score is 81 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.