Tammy W. Chan, M.D.
Obstetrics & Gynecology Physician · Westerville, OH
Tammy W. Chan, M.D. is an obstetrics & gynecology physician with a practice address in Westerville, Ohio, and NPI 1902077324, issued on Mar 13, 2008. Check the license (Ohio 35092332, as entered in NPPES) on the State Medical Board of Ohio; the Medicare figures below come from public CMS files.
- Name
- Tammy W. Chan
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License numbers
- 35092332 OH
11011777A IN
Self-reported in NPPES; status is on the state search - Practice location
- 550 S Cleveland Ave, Westerville, OH 43081
- Phone
- (614) 865-7600
- Enumerated
- Mar 13, 2008
- Record last updated
- Feb 14, 2022
- Fax
- (614) 392-2546
- Medicaid ID
- 2885794 OH
- Medicare enrollment
- Enrolled (PECOS I20090521000153); accepts Medicare assignment
- Medical or professional school
- Ohio State University College Of Medicine, 2003
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 1,572 in Ohio → Look up another NPI →
Also registered at 550 S Cleveland Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Heidi Arbona, M.D.Obstetrics & Gynecology Physician1548215551
- Stephanie Beier-Phillips, MSNWomen's Health Nurse Practitioner1760457170
- John Buchan, D.P.M.Podiatrist1437137718
Verify Tammy W. Chan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersState Medical Board of Ohio
Search for license 35092332Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
62% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
63 Medicare Part D claims for 24 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims.
Most prescribed
- Estradiol14 claims
- Premarin12 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.
Industry payments in 2024: $96.39
5 payments; by number, the most common kind was food and beverage; the largest payer was Gynesonics, Inc. The 21,429 providers of this specialty with any payment received $1,030.61 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
- OH Independent Medical Group LLCWesterville, OH
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Tammy W. Chan among 1,572 obstetrics & gynecology physician records in Ohio
Tammy W. Chan, M.D. is one of 1,572 obstetrics & gynecology physician records with a practice address in Ohio. 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 2008, is newer than 61% of them.
- NPI issued2008 · 61% of these records are older, 35% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2003 · median 2004 among the 1,041 with a school on file
- Record last updated2022 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a Ohio practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in Ohio
There are 1,572 obstetrics & gynecology physician records in Ohio.
All 1,572 in Ohio → Every provider in Westerville → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Joseph Amato, MDWesterville, OH 430811215976055
- Heidi Arbona, M.D.Westerville, OH 430811548215551
- Kimberly Cull, MDWesterville, OH 430811447205562
- Elizabeth Cummins, MDWesterville, OH 430811083653877
- Susan Davy, MDWesterville, OH 430811598704215
- Gerald Girardi, MDWesterville, OH 430811063467462
- Genevieve Hagerty, M.D.Westerville, OH 430811386645034
- Albert Hart, MDWesterville, OH 430811821037086
Common questions
What is Tammy W. Chan, M.D.'s NPI number?
Tammy W. Chan, M.D.'s National Provider Identifier (NPI) is 1902077324, issued on Mar 13, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Tammy W. Chan, M.D. located?
The NPPES record lists a practice address at 550 S Cleveland Ave, Westerville, OH, 43081. Phone: (614) 865-7600. Providers update this record themselves, so call before visiting.
How can I verify Tammy W. Chan, M.D.'s license?
NPPES lists Ohio license number 35092332, as entered by the provider. Search the State Medical Board of Ohio at https://elicense.ohio.gov/oh_verifylicense. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Tammy W. Chan, M.D. prescribe under Medicare Part D?
In 2024, Tammy W. Chan, M.D. had 63 Medicare Part D claims for 24 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. 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.