MS. ALLYSON REBECCA HORNSTEIN CNM
NPI 1811320955
Advanced Practice Midwife in Portland, ME
About Ms. Allyson Rebecca Hornstein Cnm NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MS. ALLYSON REBECCA HORNSTEIN CNM (NPI 1811320955) is an individual advanced practice midwife in Portland, Maine, licensed in Maine (CNM212005) and active in the NPI registry since August 2013. She is enrolled in Medicare PECOS, is affiliated with Maine Medical Center, and is a graduate of Other (2013).
NPPES Registry Identity
Specialties & Licenses 3
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Ms. Allyson Rebecca Hornstein Cnm is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Allyson Hornstein reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Portland, ME 04102
- Reassigned Medicare billing, Maine enrollment
- 3,140 clinicians in this Medicare group
Portland, ME 04102
- Reassigned Medicare billing, Maine enrollment
- 229 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Maine Medical Center
Acute Care Hospitals · Portland, MEPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 04102 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
PORTLAND, ME 04102
PORTLAND, ME 04102
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 Allyson Hornstein's NPI number?
The NPI number for Allyson Hornstein is 1811320955. It was assigned to this individual provider in the NPPES registry on August 13, 2013.
Where is Allyson Hornstein located?
Allyson Hornstein practices at 22 Bramhall St, Portland, ME 04102. The listed phone number is (207) 662-5400.
What is Allyson Hornstein's specialty?
The primary specialty registered for this NPI is Advanced Practice Midwife with taxonomy code 367A00000X.
Is Allyson Hornstein enrolled in Medicare?
Yes. Allyson Hornstein is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Allyson Hornstein's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Allyson Hornstein reassigns Medicare benefits to 2 organizations: Mainehealth (Portland, ME) and Maine Medical Partners (Portland, 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 Allyson Hornstein's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Allyson Hornstein accept?
Health plans from Anthem Blue Cross and Blue Shield and Harvard Pilgrim Health Care list Allyson Hornstein 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.
Is Allyson Hornstein affiliated with any hospitals?
According to CMS data, Allyson Hornstein is affiliated with Maine Medical Center.
When was this NPI record last updated?
The NPPES record for Allyson Hornstein was last updated on April 5, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years 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.
# Ms. Allyson Rebecca Hornstein, CNM · NPI 1811320955
Advanced Practice Midwife physician in Portland, Maine. Individual provider, active in the CMS NPPES registry since August 13, 2013.
## Identity
- **NPI:** 1811320955 (Entity type: Individual)
- **Enumerated:** August 13, 2013
- **Primary specialty:** Advanced Practice Midwife · taxonomy 367A00000X
- **State license:** CNM212005 (Maine)
- **Sole proprietor:** No
## Practice location
- **Address:** 22 BRAMHALL ST, Portland, ME 04102-3175
- **Phone:** (207) 662-5400
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Mainehealth (NPI 1073701157, Portland, ME); Maine Medical Partners (NPI 1104921535, Portland, ME) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2013
## Record status
- **NPPES last updated:** April 5, 2021
- **Other identifiers:** Other 000002690 (WI)
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Source: [NPI Profile](https://npiprofile.com/npi/1811320955) · Data from the CMS NPPES public registry.