Alissa Gregersen, AG-ACNP
Nurse Practitioner · Waterville, ME
Alissa Gregersen, AG-ACNP is a nurse practitioner with a practice address in Waterville, Maine, and NPI 1922508902, issued on Feb 16, 2018. Check the license (Maine CNP251909, as entered in NPPES) with the Maine board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Alissa Gregersen
- Credential
- AG-ACNP
- Primary taxonomy
- Nurse Practitioner 363L00000X
- License numbers
- CNP251909 ME
LP-0000239 DE
Self-reported in NPPES; status is on the state search - Practice location
- 149 North St, Waterville, ME 04901
- Phone
- (207) 872-1307
- Enumerated
- Feb 16, 2018
- Record last updated
- May 27, 2026
- Fax
- (207) 872-1302
- Medicare enrollment
- Enrolled (PECOS I20180502000636); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest nurse practitioner records → All 450 in Maine → Look up another NPI →
Also registered at 149 North St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Alycia Allen, MSN, NP-CFamily Nurse Practitioner1083046718
- Michael Antoniello, M.D.Emergency Medicine Physician1568470953
- Amethyst Arceo, DOFamily Medicine Physician1801913553
- Timothy Axelson, CRNACertified Registered Nurse Anesthetist1649219353
- Faith Ayepola, MDStudent in an Organized Health Care Education/Training Program1922932417
Verify Alissa Gregersen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maine board licenses this profession
Search for license CNP251909Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average nurse practitioner in 2024
133 Medicare Part D claims for 89 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D.
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
- Bayhealth Medical Center, IncDover, DE
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Alissa Gregersen among 450 nurse practitioner records in Maine
Alissa Gregersen, AG-ACNP is one of 450 nurse practitioner records with a practice address in Maine. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 65% of them.
- NPI issued2018 · 65% of these records are older, 28% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 57% of these records are
- Graduated2017 · median 2017 among the 258 with a school on file
- Record last updated2026 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a Maine practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
25 nurse practitioner records list a practice address in Waterville
They are 25 of the 870 NPPES records with a practice address in Waterville, and 450 nurse practitioner records in Maine.
All 450 in Maine → Every provider in Waterville → Nurse Practitioner nationwide →
The 8 nurse practitioner records with the nearest ZIP codes
- Megan Bell, NPWaterville, ME 049011659669711
- Harold Dean, FNPWaterville, ME 049011902918428
- Bridgett Fisher, NPWaterville, ME 049011881970887
- Claudia Glynn, FNPWaterville, ME 049011285609016
- Persis Hope, NPWaterville, ME 049011134195100
- Theresa Jacques, FNP-CWinslow, ME 049011881647709
- Deborah Martin, FNPWaterville, ME 049011518166636
- Andrea Mathieu, FNP-CWaterville, ME 049011629022132
Common questions
What is Alissa Gregersen, AG-ACNP's NPI number?
Alissa Gregersen, AG-ACNP's National Provider Identifier (NPI) is 1922508902, issued on Feb 16, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Alissa Gregersen, AG-ACNP located?
The NPPES record lists a practice address at 149 North St, Waterville, ME, 04901. Phone: (207) 872-1307. Providers update this record themselves, so call before visiting.
How can I verify Alissa Gregersen, AG-ACNP's license?
NPPES lists Maine license number CNP251909, as entered by the provider. Search the Maine board that licenses this profession; the NPPES record confirms identity only.
How much does Alissa Gregersen, AG-ACNP prescribe under Medicare Part D?
In 2024, Alissa Gregersen, AG-ACNP had 133 Medicare Part D claims for 89 beneficiaries; the average among nurse practitioner prescribers was 1,109. 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.