Selwyn E. Mahon, M.D.
Emergency Medicine Physician · Tamuning, GU
Selwyn E. Mahon, M.D. is an emergency medicine physician with a practice address in Tamuning, Guam, and NPI 1992816169, issued on Aug 31, 2006. Check the license with the Guam board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Selwyn E. Mahon
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 1119 VI
Self-reported in NPPES; status is on the state search - Practice location
- 850 Gov. Carlos Camacho Road, Tamuning, GU 96913
- Phone
- (671) 647-2350
- Enumerated
- Aug 31, 2006
- Record last updated
- Mar 23, 2016 (not updated in 10 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20260214000022); accepts Medicare assignment
- Medical or professional school
- Howard University College Of Medicine, 1990
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 29 in Guam → Look up another NPI →
Also registered at 850 Gov. Carlos Camacho Road
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Reynald Lim, M.D.Anesthesiology Physician1679549869
- Kristy Joy Mary, RDN, LDRegistered Dietitian1255981502
Verify Selwyn E. Mahon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Guam board licenses this professionCheck 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 emergency medicine physician in 2024
86 Medicare Part D claims for 60 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Most prescribed
- Prednisone13 claims
- Cephalexin11 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
- East Harbor Partners PCAlexandria, VA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Selwyn E. Mahon among 29 emergency medicine physician records in Guam
Selwyn E. Mahon, M.D. is one of 29 emergency medicine physician records with a practice address in Guam. 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 2006, is newer than 0% of them.
- NPI issued2006 · 0% of these records are older, 76% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1990 · median 2011 among the 21 with a school on file
- Record last updated2016 · 48% 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 Guam practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
6 emergency medicine physician records list a practice address in Tamuning
They are 6 of the 411 NPPES records with a practice address in Tamuning, and 29 emergency medicine physician records in Guam.
All 29 in Guam → Every provider in Tamuning → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Eric Greenfield, D.OTamuning, GU 969131457558025
- Aaron Johansen, MDOka Tamuning, GU 969131639226863
- James Last, MDOka Tamuning, GU 969131760539472
- Robert MichaudTamuning, GU 969131063615797
- Shawn Reed, MDTamuning, GU 969131518607647
- Angelito Santos, MDTamuning, GU 969131447280680
- Trenton Scheibe, MDTamuning, GU 969131063630606
- Kathryn Guffrey, M.D.Dededo, GU 969121144512252
Common questions
What is Selwyn E. Mahon, M.D.'s NPI number?
Selwyn E. Mahon, M.D.'s National Provider Identifier (NPI) is 1992816169, issued on Aug 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Selwyn E. Mahon, M.D. located?
The NPPES record lists a practice address at 850 Gov. Carlos Camacho Road, Tamuning, GU, 96913. Phone: (671) 647-2350. Providers update this record themselves, so call before visiting.
How can I verify Selwyn E. Mahon, M.D.'s license?
Search the Guam board that licenses this profession; the NPPES record confirms identity only.
How much does Selwyn E. Mahon, M.D. prescribe under Medicare Part D?
In 2024, Selwyn E. Mahon, M.D. had 86 Medicare Part D claims for 60 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.