William C. Chapin, MD
Endocrinology, Diabetes & Metabolism Physician · Portland, OR
William C. Chapin, MD is an endocrinology, diabetes & metabolism physician with a practice address in Portland, Oregon, and NPI 1083653679, issued on Jun 6, 2006. Check the license (Oregon MD22016, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- William C. Chapin
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- MD22016 OR
Self-reported in NPPES; status is on the state search - Practice location
- 4805 NE Glisan St Ste 6N40, Portland, OR 97213
- Phone
- (503) 215-6601
- Enumerated
- Jun 6, 2006
- Record last updated
- May 11, 2026
- Medicare enrollment
- Enrolled (PECOS I20101102000090); accepts Medicare assignment
- Medical or professional school
- Medical College Of Pennsylvania, 1998
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 104 in Oregon → Look up another NPI →
Also registered at 4805 NE Glisan St Ste 6N40
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Laura Andreas, RDRegistered Dietitian1952766792
- Josie Banks, RDNRegistered Dietitian1578185559
- Nicole Crotty, REGISTERED DIETITIANRegistered Dietitian1972075687
- Katie Daneshvar, MS, RD, LDRegistered Dietitian1295470938
- Lyn Dobrunick, FNPFamily Nurse Practitioner1013909142
- John Godwin, MDHematology (Internal Medicine) Physician1700863677
Verify William C. Chapin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD22016Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
47% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
1,396 Medicare Part D claims for 340 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 46% of claims.
Most prescribed
- Levothyroxine Sodium177 claims
- Methimazole90 claims
- Alendronate Sodium67 claims
- Jardiance66 claims
- Lantus Solostar65 claims
- Ozempic54 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): 87.8 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: $27.88
1 payment: food and beverage; the largest payer was Dexcom, Inc. The 5,661 providers of this specialty with any payment received $5,742.15 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 2 group practices
- Providence Health And Services - OregonPortland, OR
- Providence Health And Services OregonPortland, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William C. Chapin among 104 endocrinology, diabetes & metabolism physician records in Oregon
William C. Chapin, MD is one of 104 endocrinology, diabetes & metabolism physician records with a practice address in Oregon. 72% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 47% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated1998 · median 2001 among the 67 with a school on file
- Record last updated2026 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in Oregon
There are 104 endocrinology, diabetes & metabolism physician records in Oregon.
All 104 in Oregon → Every provider in Portland → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Patricia Burford, MDPortland, OR 972131275515041
- Nancy Curosh, MDPortland, OR 972131942298187
- Sarah Hopkins, M.D.Portland, OR 972131871892653
- Michael McClung, M.D.Portland, OR 972131477580207
- Stephen Mitchell, DOPortland, OR 972131164521654
- Olesya Petrenko, DOPortland, OR 972131427585942
- Sarah Soltman, M.D.Portland, OR 972131497044614
- Elizabeth Stephens, MDPortland, OR 972131871509364
Common questions
What is William C. Chapin, MD's NPI number?
William C. Chapin, MD's National Provider Identifier (NPI) is 1083653679, issued on Jun 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William C. Chapin, MD located?
The NPPES record lists a practice address at 4805 NE Glisan St Ste 6N40, Portland, OR, 97213. Phone: (503) 215-6601. Providers update this record themselves, so call before visiting.
How can I verify William C. Chapin, MD's license?
NPPES lists Oregon license number MD22016, 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 William C. Chapin, MD prescribe under Medicare Part D?
In 2024, William C. Chapin, MD had 1,396 Medicare Part D claims for 340 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. Part D covers Medicare prescriptions only.
What is William C. Chapin, MD's MIPS final score?
The 2023 MIPS final score is 87.8 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.