2026 NPPES data Midwife NPI 1811320955 CNM
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ALLYSON HORNSTEIN, CNM

Midwife in PORTLAND, Maine. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
Prescribing volume
11
Medicare Part D claims · Midwife avg: 118
What the federal data reveals: ALLYSON HORNSTEIN, CNM is a Midwife ([object Object]) practicing in PORTLAND, Maine with a Medicare Part D prescribing footprint of 11 claims .

What stands out: ALLYSON HORNSTEIN, CNM filed 11 Medicare Part D claims in 2023 across PORTLAND, Maine. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

ALLYSON HORNSTEIN, CNM at a glance

Quality data not reported

NPI registry status

Active

Issued 08/13/2013

NPI 1811320955

Primary specialty

Midwife

Mid-sized

5,918 US NPIs in this specialty

Medicare Part D claims

11 91% vs specialty avg

2023 prescription claims

Specialty avg: 118

Specialty distribution in Maine

How Midwife compares to other specialties among Maine providers

Maine providers

Midwife share within Maine

1. Midwife42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Midwife share within Maine

Specialty board-certification context

Estimated specialty board-certified rate — Midwife (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Midwife ABMS/AOA estimate

Est. board-certified rate (Midwife) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Midwife) — ABMS / AOA estimate

The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.

Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).

ALLYSON HORNSTEIN, CNM is a Midwife provider practicing in PORTLAND, Maine, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: CNM. NPI: 1811320955. This profile includes practice location, specialty classification, and organizational affiliations from the CMS provider registry. Provider information is self-reported to CMS and updated monthly.

ALLYSON HORNSTEIN, CNM appears in the CMS NPPES registry as a Midwife provider holding CNM credentials at 22 BRAMHALL ST, PORTLAND, ME, 04102, with a listed phone of (207) 662-5400. NPI 1811320955 was issued on 08/13/2013. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what HORNSTEIN most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 11 prescription claims written by this provider, covering N/A Medicare beneficiaries and totaling roughly $873 in drug spend. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

Midwife is a mid-sized specialty nationwide, with 5,918 enrolled providers across 54 states and an average of 118 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline. Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist — always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.

Practice Address

22 BRAMHALL ST
PORTLAND, ME 04102

Provider Details

NPI 1811320955
Specialty Midwife
Credentials CNM
Gender Female
NPI Issued 08/13/2013

Hospital and facility affiliations

Facilities where ALLYSON HORNSTEIN, CNM bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" — a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.

MAINEHEALTH
PORTLAND, ME

Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).

Medicare Part D Prescribing Data

CMS Medicare Part D prescriber-level data for calendar year 2023.

11
Total Claims
$873
Total Drug Cost
N/A
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
18
Total Day Supply
412

Patient Demographics

Average Patient Age
40.4 years
Avg HCC Risk Score
1.59

Midwife Overview

How ALLYSON HORNSTEIN, CNM fits within the Midwife landscape nationally.

5,918
Midwife Providers in US
54
States with Midwife
118
Avg Claims per Provider

ALLYSON HORNSTEIN, CNM's 11 claims are below the specialty average of 118.

Nearby Midwife Providers in Maine

Other clinicians with the same primary specialty enrolled in Maine, drawn from the same CMS NPPES roster as HORNSTEIN.

Compare Midwife nationally: see state-by-state distribution →

Frequently Asked Questions

What is ALLYSON HORNSTEIN, CNM's specialty?
ALLYSON HORNSTEIN, CNM specializes in Midwife and practices in PORTLAND, Maine. Credentials: CNM.
How much does ALLYSON HORNSTEIN, CNM prescribe under Medicare Part D?
In 2023, ALLYSON HORNSTEIN, CNM wrote 11 Medicare Part D claims totaling $873 in drug costs for N/A beneficiaries.
Where is ALLYSON HORNSTEIN, CNM located?
ALLYSON HORNSTEIN, CNM is located at 22 BRAMHALL ST, PORTLAND, ME, 04102. Phone: (207) 662-5400.
What is ALLYSON HORNSTEIN, CNM's NPI number?
ALLYSON HORNSTEIN, CNM's National Provider Identifier (NPI) is 1811320955, issued on 08/13/2013.
How many Midwife providers are there in the US?
There are 5,918 Midwife providers across 54 states in the US. The average Midwife provider writes 118 Medicare Part D claims per year.
Does ALLYSON HORNSTEIN, CNM accept Medicare?
ALLYSON HORNSTEIN, CNM appears in CMS Medicare data with 11 Part D claims and N/A Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify ALLYSON HORNSTEIN, CNM's credentials?
ALLYSON HORNSTEIN, CNM's NPI is 1811320955 with credentials CNM. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.

Data Sources

Provider Directory
CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
Specialty Classification
NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
Prescribing Data
CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
Limitations
Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.

See our complete data methodology for details on how we collect and process government data.

Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).

Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology