Quick answers
- Which hospitals does David G. Preston work at?
- Medicare's official clinician data lists David G. Preston at 1 hospital: Maine General Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does David G. Preston see patients?
- Medicare's clinician data lists 1 practice location in Waterville, ME. Call before your visit to confirm the address.
- What is David G. Preston's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does David G. Preston accept Medicare assignment?
- Yes. Medicare's clinician data says David G. Preston accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for David G. Preston?
- (207) 872-1000, as listed in official Medicare / NPI Registry data.
- What is David G. Preston's NPI number?
- 1871559203. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where David G. Preston works
Medicare's Facility Affiliation Data lists David G. Preston at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Maine General Medical CenterAugusta, ME · Acute Care Hospital · CCN 200039
Practice locations
Addresses where David G. Preston is enrolled with Medicare (CMS data updated 2026-10-02).
- 149 N StWaterville, ME 04901 (207) 872‑1000
Group practices
Medicare enrollment lists David G. Preston as a member of this group (CMS data updated 2026-10-02).
- Mainegeneral Medical Center555 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Waterville
Clinicians with the same Medicare primary specialty in Waterville, ME — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Harvard Medical School |
| Graduation year | 1986 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1871559203 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians