May S. Fan, M.D.
Family Medicine Physician · Sisters, OR
May S. Fan, M.D. is a family medicine physician with a practice address in Sisters, Oregon, and NPI 1457462939, issued on Aug 31, 2006. Check the license (Oregon MD16867, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- May S. Fan
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- MD16867 OR
Self-reported in NPPES; status is on the state search - Practice location
- 231 E Cascade Ave, Sisters, OR 97759
- Phone
- (541) 382-4900
- Enumerated
- Aug 31, 2006
- Record last updated
- Jan 22, 2022
- Fax
- (541) 549-9683
- Medicaid ID
- 012836 OR
- Medicare enrollment
- Enrolled (PECOS I20061228000045); accepts Medicare assignment
- Medical or professional school
- Un Of California, Irvine, College Of Medicine, 1987
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 2,847 in Oregon → Look up another NPI →
Verify May S. Fan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD16867Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
85% more Medicare Part D claims than the average family medicine physician in 2024
6,565 Medicare Part D claims for 633 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 79 claims were for opioids.
Most prescribed
- Atorvastatin Calcium495 claims
- Levothyroxine Sodium396 claims
- Rosuvastatin Calcium288 claims
- Amlodipine Besylate279 claims
- Lisinopril267 claims
- Gabapentin240 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 MIPS final score for 2023 (Medicare payment program): 90.4 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Bend Memorial Clinic PCSisters, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
May S. Fan among 2,847 family medicine physician records in Oregon
May S. Fan, M.D. is one of 2,847 family medicine physician records with a practice address in Oregon. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 53% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1987 · median 2009 among the 1,671 with a school on file
- Record last updated2022 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
9 family medicine physician records list a practice address in Sisters
They are 9 of the 149 NPPES records with a practice address in Sisters, and 2,847 family medicine physician records in Oregon.
All 2,847 in Oregon → Every provider in Sisters → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Soni Andreini Poulsen, MDSisters, OR 977591033196795
- Steven Greer, MDSisters, OR 977591851497184
- Jeremy Kenison, D.O.Sisters, OR 977591386087534
- Inger Lied, MDSisters, OR 977591467942227
- Kevin Miller, D.O.Sisters, OR 977591457321333
- Theodore Prier, MDSisters, OR 977591780889261
- Clayton Reinhardt, DOSisters, OR 977591174554729
- Mark Sauerwein, MDSisters, OR 977591972699163
Common questions
What is May S. Fan, M.D.'s NPI number?
May S. Fan, M.D.'s National Provider Identifier (NPI) is 1457462939, issued on Aug 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is May S. Fan, M.D. located?
The NPPES record lists a practice address at 231 E Cascade Ave, Sisters, OR, 97759. Phone: (541) 382-4900. Providers update this record themselves, so call before visiting.
How can I verify May S. Fan, M.D.'s license?
NPPES lists Oregon license number MD16867, as entered by the provider. Search the Oregon Medical Board at https://www.oregon.gov/OMB/Pages/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does May S. Fan, M.D. prescribe under Medicare Part D?
In 2024, May S. Fan, M.D. had 6,565 Medicare Part D claims for 633 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is May S. Fan, M.D.'s MIPS final score?
The 2023 MIPS final score is 90.4 of 100. 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.