1. Home
  2. Directory
  3. Maine
  4. Portland
  5. Nurse Practitioner
  6. NPI Profile

ALLISON E. SHAFFER
NPI 1821684457
Nurse Practitioner in Portland, ME

Active since December 17, 2020PECOS Enrolled
17 BISHOP ST, PORTLAND, ME 04103(207) 203-7933 Get Directions Write a Review

NPPES record last updated: September 5, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Sep 5, 2025, Jul 31, 2024, Dec 17, 2020 (3 updates tracked since 2020).

About Allison E. Shaffer NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ALLISON E. SHAFFER (NPI 1821684457) is an individual nurse practitioner in Portland, Maine, licensed in Maine (CNP251331) and active in the NPI registry since December 2020. She is enrolled in Medicare PECOS and is a graduate of Other (2025).

NPPES Registry Identity

NPI1821684457
Entity TypeIndividualFemale
Primary Taxonomy363L00000X
Provider Legal NameALLISON E. SHAFFER
Location Address17 BISHOP STPortland, ME 04103-2659
Mailing Address80 Mussey StSouth Portland, ME 04106-2009 · (603) 321-3760
Phone(207) 203-7933
Sole ProprietorNo
Medical School CMSOtherGraduated 2025
Enumeration DateDecember 17, 2020
Last NPPES UpdateSeptember 5, 20253 updates tracked since enumeration
NPPES CertifiedSeptember 5, 2025
✔ NPI 1821684457 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyNurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363L00000X
License✔ Licensed in ME · CNP251331
Definition
(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.
Also ListedRegistered NurseTaxonomy 163W00000X · License RN72170 (ME)
17 BISHOP ST, Portland, ME 04103
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, Harvard Pilgrim Health Care.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Allison E. Shaffer is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID6709376270
PECOS Enrollment IDI20251104003533
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Allison Shaffer reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

St. Mary's Regional Medical Center
29 mi
General Acute Care Hospital
93 CAMPUS AVE
Lewiston, ME 04240
  • Reassigned Medicare billing, Maine enrollment
  • Medicare enrollment name: St Marys Regional Medical Center
  • 381 clinicians in this Medicare group
NPI 1447226584 (207) 777-8100
Aroostook Mental Health Services, Inc.
235 mi
Mental Health (Including Community Mental Health Center)
180 ACADEMY ST STE 2
Presque Isle, ME 04769
  • Reassigned Medicare billing, Maine enrollment
  • 42 clinicians in this Medicare group
NPI 1487601399 (207) 764-3319

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 04103 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$86.72 typical visit price
range $56.28 – $169.96
Typical copayment $21.68 (range $14.07 – $42.49)
Most-billed visit code 99203
Established Patient
$99.18 typical visit price
range $18.22 – $138.92
Typical copayment $24.79 (range $4.55 – $34.73)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MRS. REBECCA L DROUIN LCSW
Social Worker (Clinical)
17 BISHOP ST
PORTLAND, ME 04103
Cumberland County (207) 871-1235
ALICIA M WILLIS CAC
Social Worker (Clinical)
17 BISHOP ST
PORTLAND, ME 04103
Cumberland County (207) 871-1235
JOSEPH DIFONZO CADC
Counselor (Addiction (Substance Use Disorder))
17 BISHOP ST
PORTLAND, ME 04103
Cumberland County (207) 208-9787
MS. REBECCA W SPITKO LS11320
Case Manager/Care Coordinator
17 BISHOP ST
PORTLAND, ME 04103
Cumberland County (207) 871-1235
KERRY DRACH PHD
Psychologist (Clinical)
17 BISHOP ST
PORTLAND, ME 04103
Cumberland County (207) 871-1235
ANTHONY W BEATTIE LMHC, LCC
Counselor (Mental Health)
17 BISHOP ST
PORTLAND, ME 04103
Cumberland County (207) 871-1235
JESSICA OESTERHELDER M.D.
Psychiatry & Neurology (Child & Adolescent Psychiatry)
17 BISHOP ST
PORTLAND, ME 04103
Cumberland County (207) 871-1235
KASSADI MCPHERSON
Counselor (Addiction (Substance Use Disorder))
17 BISHOP ST
PORTLAND, ME 04103
Cumberland County (207) 203-7933

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Allison Shaffer's NPI number?

The NPI number for Allison Shaffer is 1821684457. It was assigned to this individual provider in the NPPES registry on December 17, 2020.

Where is Allison Shaffer located?

Allison Shaffer practices at 17 Bishop St, Portland, ME 04103. The listed phone number is (207) 203-7933.

What is Allison Shaffer's specialty?

The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.

Is Allison Shaffer enrolled in Medicare?

Yes. Allison Shaffer is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Allison Shaffer's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Allison Shaffer reassigns Medicare benefits to 2 organizations: St. Mary's Regional Medical Center (Lewiston, ME) and Aroostook Mental Health Services, Inc. (Presque Isle, ME). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Allison Shaffer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Allison Shaffer accept?

Health plans from Anthem Blue Cross and Blue Shield and Harvard Pilgrim Health Care list Allison Shaffer as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Allison Shaffer was last updated on September 5, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.