NPI registry status
Active
2026 NPPES data Adult Psychiatric/Mental Health Registered Nurse NPI 1871950477 PMHNP
Verify on CMS → Shelley Halligan, PMHNP
Adult Psychiatric/Mental Health Registered Nurse in North Haven, Connecticut.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 4,589 in Adult Psychiatric/Mental Health Registered Nurse, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
40
Medicare Part D claims · Adult Psychiatric/Mental Health Registered Nurse avg: 1K
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Shelley Halligan, PMHNP filed 40 Medicare Part D claims in 2023 as a Adult Psychiatric/Mental Health Registered Nurse in North Haven, Connecticut.
- 40
- Part D claims, 2023
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Shelley Halligan, PMHNP's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
40 0th percentile higher than 0% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
What does the federal data show about Shelley Halligan, PMHNP?
Quality data not reportedPrimary specialty
Adult Psychiatric/Mental Health Registered Nurse
Medicare Part D claims
40 97% vs specialty avg
Specialty distribution in Connecticut
How Adult Psychiatric/Mental Health Registered Nurse compares to other specialties among Connecticut providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Adult Psychiatric/Mental Health Registered Nurse. Verify directly:
How MIPS and board certification work
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).
Shelley Halligan, PMHNP appears in the CMS NPPES registry as an Adult Psychiatric/Mental Health Registered Nurse provider holding PMHNP credentials at 556 WASHINGTON AVE, North Haven, CT, 06473, with a listed phone of (203) 779-5799. NPI 1871950477 was issued on 01/27/2016.
Medicare Part D records for calendar year 2023 show 40 prescription claims written by this provider, covering N/A Medicare beneficiaries and totaling roughly $590 in drug spend, with an opioid prescribing rate of 30.0%.
Adult Psychiatric/Mental Health Registered Nurse is a narrow specialty nationwide, with 4,589 enrolled providers across 52 states and an average of 1,143 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
Provider Details
| NPI | 1871950477 |
|---|---|
| Specialty | Adult Psychiatric/Mental Health Registered Nurse |
| Credentials | PMHNP |
| Gender | Female |
| NPI Issued | 01/27/2016 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
40
Total Claims
$590
Total Drug Cost
N/A
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 44
- Total Day Supply
- 850
- Brand Drug Cost
- $0
- Generic Drug Cost
- $590
- Opioid Claims
- 12 (30.0% rate)
Patient Demographics
- Average Patient Age
- 65.0 years
- Avg HCC Risk Score
- 0.95
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| Tramadol Hcl | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Adult Psychiatric/Mental Health Registered Nurse in CT →
All providers in Connecticut →
Compare specialties →
Adult Psychiatric/Mental Health Registered Nurse Overview
How Shelley Halligan, PMHNP fits within the Adult Psychiatric/Mental Health Registered Nurse landscape nationally.
4,589
Adult Psychiatric/Mental Health Registered Nurse Providers in US
52
States with Adult Psychiatric/Mental Health Registered Nurse
1,143
Avg Claims per Provider
Shelley Halligan, PMHNP's 40 claims are below the specialty average of 1,143.
Nearby Adult Psychiatric/Mental Health Registered Nurse Providers in Connecticut
Other clinicians with the same primary specialty enrolled in Connecticut, drawn from the same CMS NPPES roster as Halligan.
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Connecticut medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Adult Psychiatric/Mental Health Registered Nurse peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
Healthcare Guides
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How to Find a Doctor
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Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Connecticut
Frequently Asked Questions
What is Shelley Halligan, PMHNP's specialty? ▼
Shelley Halligan, PMHNP specializes in Adult Psychiatric/Mental Health Registered Nurse and practices in North Haven, Connecticut. Credentials: PMHNP.
How much does Shelley Halligan, PMHNP prescribe under Medicare Part D? ▼
In 2023, Shelley Halligan, PMHNP wrote 40 Medicare Part D claims totaling $590 in drug costs for N/A beneficiaries.
Where is Shelley Halligan, PMHNP located? ▼
Shelley Halligan, PMHNP is located at 556 WASHINGTON AVE, North Haven, CT, 06473. Phone: (203) 779-5799.
What is Shelley Halligan, PMHNP's NPI number? ▼
Shelley Halligan, PMHNP's National Provider Identifier (NPI) is 1871950477, issued on 01/27/2016.
Does Shelley Halligan, PMHNP prescribe opioids? ▼
Yes, Shelley Halligan, PMHNP had 12 opioid claims in 2023 with an opioid prescribing rate of 30.0%.
How many Adult Psychiatric/Mental Health Registered Nurse providers are there in the US? ▼
There are 4,589 Adult Psychiatric/Mental Health Registered Nurse providers across 52 states in the US. The average Adult Psychiatric/Mental Health Registered Nurse provider writes 1,143 Medicare Part D claims per year.
What drugs does Shelley Halligan, PMHNP prescribe most often? ▼
Based on 2023 Medicare Part D data, Shelley Halligan, PMHNP's most frequently prescribed drugs include Tramadol Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Shelley Halligan, PMHNP accept Medicare? ▼
Shelley Halligan, PMHNP appears in CMS Medicare data with 40 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 Shelley Halligan, PMHNP's credentials? ▼
Shelley Halligan, PMHNP's NPI is 1871950477 with credentials PMHNP. 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
View source datasets and methodology notes
- 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
Compiled from official public sources by the PlainDoctor editorial team.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.