Clifford John Swap, MD
Emergency Medicine Physician · Boston, MA
Clifford John Swap, MD is an emergency medicine physician with a practice address in Boston, Massachusetts, and NPI 1881715217, issued on Apr 3, 2007. Check the license (Massachusetts L-225291, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Clifford John Swap
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- L-225291 MA
Self-reported in NPPES; status is on the state search - Practice location
- Massachusetts General Hospital, Boston, MA 02114
- Phone
- (617) 724-4184
- Enumerated
- Apr 3, 2007
- Record last updated
- Nov 18, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20091019000345); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,829 in Massachusetts → Look up another NPI →
Also registered at Massachusetts General Hospital
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Clifford John Swap in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license L-225291Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
17% fewer Medicare Part D claims than the average emergency medicine physician in 2024
188 Medicare Part D claims for 143 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 29 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen18 claims
- Ondansetron Odt14 claims
- Cefpodoxime Proxetil13 claims
- Cefadroxil12 claims
- Amoxicillin-Clavulanate Potass11 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 one group practice
- Southern California Permanente Medical GroupSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Clifford John Swap among 1,829 emergency medicine physician records in Massachusetts
Clifford John Swap, MD is one of 1,829 emergency medicine 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 2007, is newer than 41% of them.
- NPI issued2007 · 41% of these records are older, 51% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2004 · median 2011 among the 1,200 with a school on file
- Record last updated2021 · 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 207P00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
543 emergency medicine physician records list a practice address in Boston
They are 543 of the 41,865 NPPES records with a practice address in Boston, and 1,829 emergency medicine physician records in Massachusetts.
All 1,829 in Massachusetts → Every provider in Boston → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Daniel Corboy, MDBoston, MA 021141639153471
- Henry Epino, MDBoston, MA 021141790767911
- Joshua Goldstein, MD, PHDBoston, MA 021141114917341
- Christopher Kabrhel, MDBoston, MA 021141164404596
- Shan Liu, MDBoston, MA 021141538140058
- Keith Marill, MDBoston, MA 021141073503371
- Murray McLachlan, MDBoston, MA 021141144204975
- Emily Miller, MDBoston, MA 021141568452282
Common questions
What is Clifford John Swap, MD's NPI number?
Clifford John Swap, MD's National Provider Identifier (NPI) is 1881715217, issued on Apr 3, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Clifford John Swap, MD located?
The NPPES record lists a practice address at Massachusetts General Hospital, Boston, MA, 02114. Phone: (617) 724-4184. Providers update this record themselves, so call before visiting.
How can I verify Clifford John Swap, MD's license?
NPPES lists Massachusetts license number L-225291, 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 Clifford John Swap, MD prescribe under Medicare Part D?
In 2024, Clifford John Swap, MD had 188 Medicare Part D claims for 143 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.