Leigh Holman Simmons, M.D.
Internal Medicine Physician · Boston, MA
Leigh Holman Simmons, M.D. is an internal medicine physician with a practice address in Boston, Massachusetts, and NPI 1437279478, issued on Mar 31, 2007. Check the license (Massachusetts 221657, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Leigh Holman Simmons
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 221657 MA
Self-reported in NPPES; status is on the state search - Practice location
- 15 Parkman St, Boston, MA 02114
- Phone
- (617) 726-2368
- Enumerated
- Mar 31, 2007
- Record last updated
- Dec 18, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (617) 726-6861
- Medicare enrollment
- Enrolled (PECOS I20070810000361); accepts Medicare assignment
- Medical or professional school
- Vanderbilt University School Of Medicine, 2004
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 15 Parkman St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Leigh Holman Simmons in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 221657Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
43% more Medicare Part D claims than the average internal medicine physician in 2024
4,528 Medicare Part D claims for 382 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 68 claims were for opioids.
Most prescribed
- Atorvastatin Calcium335 claims
- Amlodipine Besylate257 claims
- Levothyroxine Sodium194 claims
- Lisinopril168 claims
- Eliquis143 claims
- Omeprazole140 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 2 group practices
- Massachusetts General Physicians Organization IncBoston, MA
- The General Hospital CorporationWaltham, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Leigh Holman Simmons among 6,825 internal medicine physician records in Massachusetts
Leigh Holman Simmons, M.D. is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 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 2007, is newer than 46% of them.
- NPI issued2007 · 46% of these records are older, 45% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2004 · median 2004 among the 4,103 with a school on file
- Record last updated2008 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
2,320 internal medicine physician records list a practice address in Boston
They are 2,320 of the 41,865 NPPES records with a practice address in Boston, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Boston → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Jaime Chang, MDBoston, MA 021141205825197
- Jeffrey Engelman, MD PHDBoston, MA 021141538159108
- James Evans, MDBoston, MA 021141215939533
- Nicolette Fontaine, MDBoston, MA 021141841287174
- Nancy Gagliano, MDBoston, MA 021141881680767
- Patricia Gibbons, MDBoston, MA 021141619967221
- Steven Hersch, MDBoston, MA 021141174512149
- Mira Kautzky, M.D.Boston, MA 021141972505402
Common questions
What is Leigh Holman Simmons, M.D.'s NPI number?
Leigh Holman Simmons, M.D.'s National Provider Identifier (NPI) is 1437279478, issued on Mar 31, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Leigh Holman Simmons, M.D. located?
The NPPES record lists a practice address at 15 Parkman St, Boston, MA, 02114. Phone: (617) 726-2368. Providers update this record themselves, so call before visiting.
How can I verify Leigh Holman Simmons, M.D.'s license?
NPPES lists Massachusetts license number 221657, 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 Leigh Holman Simmons, M.D. prescribe under Medicare Part D?
In 2024, Leigh Holman Simmons, M.D. had 4,528 Medicare Part D claims for 382 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.