NPI registry status
Active
2026 NPPES data Psychiatric/Mental Health Nurse Practitioner NPI 1609908052 APNP
Verify on CMS → Ann O'Brien, APNP
Psychiatric/Mental Health Nurse Practitioner in Eastport, Maine.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 40,776 in Psychiatric/Mental Health Nurse Practitioner, 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
1K
Medicare Part D claims · 50 beneficiaries · Psychiatric/Mental Health Nurse Practitioner avg: 927
Generic prescribing
90%
generic claims · 10% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Ann O'Brien, APNP filed 1,471 Medicare Part D claims in 2023 as a Psychiatric/Mental Health Nurse Practitioner in Eastport, Maine, prescribing 90% generic.
- 1K
- Part D claims, 2023
- 90%
- generic prescribing
- ≥80th
- pct by Part D claim volume (lower-bound band)
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.
Federal trust snapshot
What official records show about Ann O'Brien, APNP
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1609908052), first enumerated 03/12/2007.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 1,471 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1609908052 · Psychiatric/Mental Health Nurse Practitioner
NPI-10 · ENUM-MID · TAX-MID · RX-MID · BOOK-THIN · PHOTO-ENUM
- NPI-10 1609908052
- ENUM-MID 2007
- TAX-MID 41K Psychiatric/Mental Health
- RX-MID 1,471
- BOOK-THIN 382 in Maine
- PHOTO-ENUM Kirsten Daly · 2007
Ann O'Brien, APNP's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,471 ≥ 80th percentile 80% of 1,370,886 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
What does the federal data show about Ann O'Brien, APNP?
Quality data not reportedPrimary specialty
Psychiatric/Mental Health Nurse Practitioner
Medicare Part D claims
1,471 59% vs specialty avg
Specialty distribution in Maine
How Psychiatric/Mental Health Nurse Practitioner compares to other specialties among Maine 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 Psychiatric/Mental Health Nurse Practitioner. 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).
Practice Address
Provider Details
| NPI | 1609908052 |
|---|---|
| Specialty | Psychiatric/Mental Health Nurse Practitioner |
| Credentials | APNP |
| Gender | Female |
| NPI Issued | 03/12/2007 |
Hospital and facility affiliations
Facilities where Ann O'Brien, APNP 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.
Eastport Health Care, Inc
Eastport, 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).
Brand vs generic prescribing mix · Typical
Ann O'Brien, APNP - brand share 10.0%
Psychiatric/Mental Health Nurse Practitioner average
10% brand-name claims vs 90% generic, on 1,471 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
1,471
Total Claims
$186K
Total Drug Cost
50
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,880
- Total Day Supply
- 51,456
- Brand vs Generic
- 10% brand / 90% generic
- Brand Drug Cost
- $136K
- Generic Drug Cost
- $49K
Patient Demographics
- Average Patient Age
- 55.9 years
- Avg HCC Risk Score
- 1.09
- Gender Split
- 56% female / 44% male
- Age Distribution
- <65: 33, 65-74: 11, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Ann O'Brien, APNP prescribes most
Top Medicare Part D drugs by claim count, 2023
- Clonazepam
Clonazepam
104 claims
- Trazodone Hcl
Trazodone Hcl
85 claims
- Gabapentin
Gabapentin
71 claims
- Lorazepam
Lorazepam
67 claims
- Olanzapine
Olanzapine
67 claims
- Sertraline Hcl
Sertraline Hcl
65 claims
- Duloxetine Hcl
Duloxetine Hcl
64 claims
- Quetiapine Fumarate
Quetiapine Fumarate
58 claims
| Drug | Claims |
|---|---|
| Clonazepam | 104 |
| Trazodone Hcl | 85 |
| Gabapentin | 71 |
| Lorazepam | 67 |
| Olanzapine | 67 |
| Sertraline Hcl | 65 |
| Duloxetine Hcl | 64 |
| Quetiapine Fumarate | 58 |
| Divalproex Sodium Er Divalproex Sodium | 57 |
| Lithium Carbonate | 50 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Psychiatric/Mental Health Nurse Practitioner in ME →
All providers in Maine →
Compare specialties →
Psychiatric/Mental Health Nurse Practitioner Overview
How Ann O'Brien, APNP fits within the Psychiatric/Mental Health Nurse Practitioner landscape nationally.
40,776
Psychiatric/Mental Health Nurse Practitioner Providers in US
54
States with Psychiatric/Mental Health Nurse Practitioner
927
Avg Claims per Provider
Ann O'Brien, APNP's 1,471 claims are above the specialty average of 927.
Nationwide Psychiatric/Mental Health Nurse Practitioner peers with similar MIPS or enrollment year
Two federal-record peer sets for O'Brien, both outside Maine so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2007)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Psychiatric/Mental Health Nurse Practitioner Providers in Maine
Other clinicians with the same primary specialty enrolled in Maine, drawn from the same CMS NPPES roster as O'Brien.
One of 382 Psychiatric/Mental Health Nurse Practitioner providers enrolled in Maine, 5 are shown here.
Dr. Amanda Adamen
PMHNP
Bethel, ME
Dr. Kristen Aleva
APRN
Eliot, ME
Dr. Suzanne Alexis
PMHNP-BC
Farmington, ME
Dr. Claudine Allen
PMHNP
Bangor, ME
Sara Anderson
Brunswick, ME
Compare Psychiatric/Mental Health Nurse Practitioner nationally: see state-by-state distribution →
Frequently Asked Questions
What is Ann O'Brien, APNP's specialty? ▼
Ann O'Brien, APNP specializes in Psychiatric/Mental Health Nurse Practitioner and practices in Eastport, Maine. Credentials: APNP.
How much does Ann O'Brien, APNP prescribe under Medicare Part D? ▼
In 2023, Ann O'Brien, APNP wrote 1,471 Medicare Part D claims totaling $186K in drug costs for 50 beneficiaries.
Where is Ann O'Brien, APNP located? ▼
Ann O'Brien, APNP is located at 30 BOYNTON ST, Eastport, ME, 04631. Phone: (207) 853-6001.
What is Ann O'Brien, APNP's NPI number? ▼
Ann O'Brien, APNP's National Provider Identifier (NPI) is 1609908052, issued on 03/12/2007.
Does Ann O'Brien, APNP prescribe more brand-name or generic drugs? ▼
Ann O'Brien, APNP's prescribing is 10% brand-name and 90% generic drugs by claim count, with $136K in brand drug costs.
How many Psychiatric/Mental Health Nurse Practitioner providers are there in the US? ▼
There are 40,776 Psychiatric/Mental Health Nurse Practitioner providers across 54 states in the US. The average Psychiatric/Mental Health Nurse Practitioner provider writes 927 Medicare Part D claims per year.
What drugs does Ann O'Brien, APNP prescribe most often? ▼
Based on 2023 Medicare Part D data, Ann O'Brien, APNP's most frequently prescribed drugs include Clonazepam, Trazodone Hcl, Gabapentin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Ann O'Brien, APNP accept Medicare? ▼
Ann O'Brien, APNP appears in CMS Medicare data with 1,471 Part D claims and 50 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ann O'Brien, APNP's credentials? ▼
Ann O'Brien, APNP's NPI is 1609908052 with credentials APNP. 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
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.