Eric Mark Greenfield, D.O
Emergency Medicine Physician · Tamuning, GU
Eric Mark Greenfield, D.O is an emergency medicine physician with a practice address in Tamuning, Guam, and NPI 1457558025, issued on Jun 28, 2007. Check the license (Guam DO0064, as entered in NPPES) with the Guam board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Eric Mark Greenfield
- Credential
- D.O
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License numbers
- DO0064 GU
RTP002364 GA
Self-reported in NPPES; status is on the state search - Practice location
- 850 Gov Carlos G Camacho RD, Tamuning, GU 96913
- Phone
- (671) 988-7814
- Enumerated
- Jun 28, 2007
- Record last updated
- May 16, 2016 (not updated in 10 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20161111000177); accepts Medicare assignment
- Medical or professional school
- Ohio Medical University, 2007
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 29 in Guam → Look up another NPI →
Also registered at 850 Gov Carlos G Camacho RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Angelina Eustaquio, PHARMDPharmacist1336493378
- Margaret Kang, PHARM.D.Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist1528626116
- Sangjung KimCertified Registered Nurse Anesthetist1619795424
Verify Eric Mark Greenfield in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Guam board licenses this profession
Search for license DO0064Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
54% fewer Medicare Part D claims than the average emergency medicine physician in 2024
103 Medicare Part D claims for 75 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 18 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen15 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
- Middle Tennessee Emergency Physicians, P.C.Nashville, TN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Eric Mark Greenfield among 29 emergency medicine physician records in Guam
Eric Mark Greenfield, D.O 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 2007, is newer than 24% of them.
- NPI issued2007 · 24% of these records are older, 59% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2007 · 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
- Aaron Johansen, MDOka Tamuning, GU 969131639226863
- James Last, MDOka Tamuning, GU 969131760539472
- Selwyn Mahon, M.D.Tamuning, GU 969131992816169
- 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 Eric Mark Greenfield, D.O's NPI number?
Eric Mark Greenfield, D.O's National Provider Identifier (NPI) is 1457558025, issued on Jun 28, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Eric Mark Greenfield, D.O located?
The NPPES record lists a practice address at 850 Gov Carlos G Camacho RD, Tamuning, GU, 96913. Phone: (671) 988-7814. Providers update this record themselves, so call before visiting.
How can I verify Eric Mark Greenfield, D.O's license?
NPPES lists Guam license number DO0064, as entered by the provider. Search the Guam board that licenses this profession; the NPPES record confirms identity only.
How much does Eric Mark Greenfield, D.O prescribe under Medicare Part D?
In 2024, Eric Mark Greenfield, D.O had 103 Medicare Part D claims for 75 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.