Isabella Phan, MD
Ophthalmology Physician · San Francisco, CA
Isabella Phan, MD is an ophthalmology physician with a practice address in San Francisco, California, and NPI 1598977415, issued on May 4, 2007. Check the license (California 99033, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Isabella Phan
- Credential
- MD
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- 99033 CA
Self-reported in NPPES; status is on the state search - Practice location
- 400 Parnassus Ave, San Francisco, CA 94143
- Phone
- (415) 353-2608
- Enumerated
- May 4, 2007
- Record last updated
- Jan 18, 2022
- Medicare enrollment
- Enrolled (PECOS I20100524000327); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 2005
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →
Also registered at 400 Parnassus Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Justin Ahn, M.D.Urology Physician1063755148
- Weiyun Ai, MDMedical Oncology Physician1649346842
Verify Isabella Phan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 99033Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
28% fewer Medicare Part D claims than the average ophthalmology physician in 2024
1,096 Medicare Part D claims for 244 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 31% of claims.
Most prescribed
- Prednisolone Acetate290 claims
- Latanoprost151 claims
- Moxifloxacin142 claims
- Dorzolamide-Timolol61 claims
- Fluorouracil59 claims
- Neomycin-Polymyxin-Dexameth48 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.
Bills Medicare through one group practice
- Permanente Medical Group IncSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Isabella Phan among 2,899 ophthalmology physician records in California
Isabella Phan, MD 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 2007, is newer than 55% of them.
- NPI issued2007 · 55% of these records are older, 33% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2005 · median 2001 among the 1,907 with a school on file
- Record last updated2022 · 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 San Francisco → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Nisha Acharya, M.D.San Francisco, CA 941431972544872
- Robert Bhisitkul, MDSan Francisco, CA 941431831138676
- Joseph Crawford, MDSan Francisco, CA 941431831141712
- Eugene De Juan, MDSan Francisco, CA 941431043262074
- Jacque Duncan, MDSan Francisco, CA 941431942252978
- Allan Flach, MDSan Francisco, CA 941431043261134
- Jonathan Horton, MDSan Francisco, CA 941431992757363
- David Hwang, MDSan Francisco, CA 941431346292224
Common questions
What is Isabella Phan, MD's NPI number?
Isabella Phan, MD's National Provider Identifier (NPI) is 1598977415, issued on May 4, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Isabella Phan, MD located?
The NPPES record lists a practice address at 400 Parnassus Ave, San Francisco, CA, 94143. Phone: (415) 353-2608. Providers update this record themselves, so call before visiting.
How can I verify Isabella Phan, MD's license?
NPPES lists California license number 99033, 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 Isabella Phan, MD prescribe under Medicare Part D?
In 2024, Isabella Phan, MD had 1,096 Medicare Part D claims for 244 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
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.