Alissa Gregersen, AG-ACNP
NPI 1922508902 · Nurse Practitioner · Waterville, ME
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Alissa Gregersen, AG-ACNP is a Nurse Practitioner provider in Waterville, ME (NPI 1922508902).
Provider details
- NPI number
- 1922508902
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- AG-ACNP
- Sex
- Female
- Sole proprietor
- No
- License
- LP-0000239 (DE)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
8 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
107 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) |
|---|---|---|
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 41 | $143 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 37 | $67 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 16 | $98 |
| Initial Hospital Care With Same-Day Admission and Discharge With High Level of Medical Decision Making, Per Day, If Using Time, at Least 85 Minutes99236 | 13 | $172 |
Typical Medicare-allowed amounts for these services range $67–$172 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2018-02-16
- Last updated
- 2026-05-27
- Certified
- 2026-05-27
Frequently asked questions
- What is Alissa Gregersen's NPI number?
- Alissa Gregersen's National Provider Identifier (NPI) is 1922508902, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Alissa Gregersen's specialty?
- Alissa Gregersen is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Alissa Gregersen located?
- Alissa Gregersen's practice location on file with NPPES is 149 North St, Waterville, ME 04901-4974.
- What is Alissa Gregersen's phone number?
- The practice phone number listed in the NPPES registry for Alissa Gregersen is (207) 872-1307.
- Does Alissa Gregersen accept Medicare?
- Alissa Gregersen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Alissa Gregersen's NPI active?
- Yes — Alissa Gregersen's NPI (1922508902) is active in the NPPES registry as of the last update on 2026-05-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.