Grant Oakley, D.O.
NPI 1679927537 · Nephrology Physician · Portland, ME
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Grant Oakley, D.O. is a Nephrology Physician provider in Portland, ME (NPI 1679927537).
Provider details
- NPI number
- 1679927537
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- DO3180 (ME)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
10 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
721 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Dialysis Services, 4 Or More Physician Visits Per Month (20 Years Or Older)90960 | 293 | $357 |
| Dialysis Services, 2-3 Physician Visits Per Month (20 Years Or Older)90961 | 96 | $297 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 72 | $96 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 68 | $80 |
| Hemodialysis Procedure With Physician Evaluation90935 | 55 | $72 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 53 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 13 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 75 | 26 |
| Lisinopril | 49 | 17 |
| Losartan Potassium | 41 | 19 |
| Sevelamer Carbonate | 40 | 19 |
| Hydralazine Hcl | 28 | 12 |
| Furosemide | 23 | — |
| Chlorthalidone | 19 | — |
| Hydrochlorothiazide |
Practice location
Mailing address
Additional practice locations (1)
- 22 Bramhall StPortland, ME 04102-3134Phone: (207) 662-0111
Registry dates
- Enumerated
- 2016-04-18
- Last updated
- 2021-08-03
- Certified
- 2021-08-03
Frequently asked questions
- What is Grant Oakley's NPI number?
- Grant Oakley's National Provider Identifier (NPI) is 1679927537, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Grant Oakley's specialty?
- Grant Oakley is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Grant Oakley located?
- Grant Oakley's practice location on file with NPPES is 1600 Congress St Ste B, Portland, ME 04102-2148.
- What is Grant Oakley's phone number?
- The practice phone number listed in the NPPES registry for Grant Oakley is (207) 774-5222.
- Does Grant Oakley accept Medicare?
- Grant Oakley is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Grant Oakley's NPI active?
- Yes — Grant Oakley's NPI (1679927537) is active in the NPPES registry as of the last update on 2021-08-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.