Doctors and health care providers in Oka Tamuning, GU
13 individual NPPES records list a Oka Tamuning practice address, 7th of 10 Guam cities. The largest group is diagnostic radiology physician: 2, 15% of the city's records, against 2% across Guam.
The 8 largest groups in Oka Tamuning
Source: CMS NPPES primary taxonomy, loaded Aug 27, 2026.
Oka Tamuning in Guam
- Rank in Guam7th of 10 cities by records
- Share of the state1.6% of Guam's records
- Specialties present8 taxonomy codes
- Top three groups46.2% of all records
- Diagnostic Radiology Physician rank2nd of the 4 Guam cities with the most
Providers in Oka Tamuning, alphabetically
- Alix Chenet, MDInternal Medicine Physician1669530507
- John Garrido, MDPediatrics Physician1720135429
- Tedd Groshong, DOEmergency Medical Services (Emergency Medicine) Physician1831246065
- Aaron Johansen, MDEmergency Medicine Physician1639226863
- Robert Kwok, MDDiagnostic Radiology Physician1710043609
- James Last, MDEmergency Medicine Physician1760539472
- Arthur Loerzel, MD FCAPAnatomic Pathology Physician1851448096
- Gilbert Lopez, MDAnesthesiology Physician1265597579
- Goldelina Marfori, MDAnesthesiology Physician1437206133
- James Murphy, MD FACEPEmergency Medical Services (Emergency Medicine) Physician1013074244
- Rengaraju Ramasamy, MDInternal Medicine Physician1720284425
- Jonathan Sidell, MDObstetrics & Gynecology Physician1477600187
- John Young, MDDiagnostic Radiology Physician1629120381
How to read this directory
Oka Tamuning, Guam appears in the CMS National Plan and Provider Enumeration System with 13 registered healthcare providers spanning 8 distinct NUCC-taxonomy specialties. This count includes every individual clinician who has applied for an NPI and listed a practice address in Oka Tamuning - physicians, dentists, nurse practitioners, physician assistants, chiropractors, physical therapists, optometrists, psychologists, podiatrists, and every other credentialed provider type CMS tracks. It does not measure hospital beds, urgent-care capacity, or whether a given clinic is accepting new patients; it measures the pool of professionals with current NPI enrollment and a Oka Tamuning practice location on file. Every figure is drawn from the federal National Provider Identifier Registry (CMS NPPES) - more than 7 million providers, maintained since May 2007, with 2024 Medicare Part D data, and, according to CMS, can be searched, compared, and traced in our methodology.
The provider mix in Oka Tamuning is weighted toward Diagnostic Radiology Physician (2 clinicians, followed by Internal Medicine Physician with 2 and Emergency Medical Services (Emergency Medicine) Physician with 2). That distribution reflects how NPPES records specialty: providers self-select a primary taxonomy code, so a family physician who also practices geriatrics will show up under whichever NUCC code they registered first. Relative to Guam's population, Oka Tamuning reports roughly 8.5 providers per 100,000 residents using the state-level denominator, which is a rough proxy rather than a precise access-to-care measurement; the true catchment area of any {cityName} clinician extends beyond the municipal boundary.
Of Guam's most common specialties, Pharmacist is the most prominent one with no provider currently listing a Oka Tamuning practice address, a coverage gap Oka Tamuning patients typically fill by traveling to a larger nearby hub.
For Oka Tamuning patients, this directory is most useful as a starting shortlist. Important: PlainDoctor is a directory of publicly available CMS government data, not a review site, a ranking, or medical advice. NPPES data is self-reported and refreshed monthly; call the practice directly to confirm the provider is still there, accepts your insurance, and is taking new patients.
For informational purposes only; this directory is not medical advice and not a substitute for checking a license. See also: how to find a doctor and how to verify one.
Common questions
How many doctors are in Oka Tamuning, GU?
There are 13 registered healthcare providers in Oka Tamuning, GU, covering 8 specialties. This includes physicians, dentists, therapists, and other licensed providers.
What are the most common medical specialties in Oka Tamuning?
The most common specialties in Oka Tamuning are Diagnostic Radiology Physician, Internal Medicine Physician, Emergency Medical Services (Emergency Medicine) Physician, Emergency Medicine Physician, Anesthesiology Physician. Diagnostic Radiology Physician has the most providers with 2.
Source: CMS National Plan and Provider Enumeration System (NPPES), file loaded Aug 27, 2026 (NPPES files on CMS.gov). Records are self-reported registrations, not licenses.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.