Barrett L. Chapin, MD
Endocrinology, Diabetes & Metabolism Physician · Springfield, MA
Barrett L. Chapin, MD is an endocrinology, diabetes & metabolism physician with a practice address in Springfield, Massachusetts, and NPI 1629009493, issued on Jul 6, 2006. Check the license (Massachusetts 73474, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Barrett L. Chapin
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License numbers
- 73474 MA
10323 NH
Self-reported in NPPES; status is on the state search - Practice location
- 3300 Main Street, Springfield, MA 01107
- Phone
- (413) 794-7031
- Enumerated
- Jul 6, 2006
- Record last updated
- Dec 2, 2022
- Fax
- (413) 794-7133
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 522 in Massachusetts → Look up another NPI →
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Verify Barrett L. Chapin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 73474Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
43 Medicare Part D claims for 27 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 33% of 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.
Barrett L. Chapin among 522 endocrinology, diabetes & metabolism physician records in Massachusetts
Barrett L. Chapin, MD is one of 522 endocrinology, diabetes & metabolism physician records with a practice address in Massachusetts. 82% 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 14% of them.
- NPI issued2006 · 14% of these records are older, 52% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 72% of these records are
- Record last updated2022 · 60% 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 Massachusetts 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 Massachusetts
There are 522 endocrinology, diabetes & metabolism physician records in Massachusetts.
All 522 in Massachusetts → Every provider in Springfield → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Kimberly Browne-Martin, M.D.Springfield, MA 011071174510465
- Michele Gortakowski, M.D.Springfield, MA 011071710243621
- Jordesha Hodge, M.D.Springfield, MA 011071861955155
- Setana Idriss, MDSpringfield, MA 011071427518521
- Barry Izenstein, M.D.Springfield, MA 011071346237583
- Issra Jamal, MDSpringfield, MA 011071457792871
- Cecilia Lozier, M.D.Springfield, MA 011071316382823
- Neha Malhotra, M.D.Springfield, MA 011071265682397
Common questions
What is Barrett L. Chapin, MD's NPI number?
Barrett L. Chapin, MD's National Provider Identifier (NPI) is 1629009493, issued on Jul 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Barrett L. Chapin, MD located?
The NPPES record lists a practice address at 3300 Main Street, Springfield, MA, 01107. Phone: (413) 794-7031. Providers update this record themselves, so call before visiting.
How can I verify Barrett L. Chapin, MD's license?
NPPES lists Massachusetts license number 73474, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Barrett L. Chapin, MD prescribe under Medicare Part D?
In 2024, Barrett L. Chapin, MD had 43 Medicare Part D claims for 27 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.