NPI registry status
Active
2026 NPPES data Psychiatric/Mental Health Clinical Nurse Specialist NPI 1790817732 PHD, RN, CS
Verify on CMS → Katharine Larsson, PHD, RN, CS
Psychiatric/Mental Health Clinical Nurse Specialist in Brookline, Massachusetts.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 978 in Psychiatric/Mental Health Clinical Nurse Specialist, 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
180
Medicare Part D claims · 19 beneficiaries · Psychiatric/Mental Health Clinical Nurse Specialist 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
Katharine Larsson, PHD, RN, CS filed 180 Medicare Part D claims in 2023 as a Psychiatric/Mental Health Clinical Nurse Specialist in Brookline, Massachusetts.
- 180
- 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.
Katharine Larsson, PHD, RN, CS's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
180 35th percentile higher than 35% 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 Katharine Larsson, PHD, RN, CS?
Quality data not reportedPrimary specialty
Psychiatric/Mental Health Clinical Nurse Specialist
Medicare Part D claims
180 83% vs specialty avg
Specialty distribution in Massachusetts
How Psychiatric/Mental Health Clinical Nurse Specialist compares to other specialties among Massachusetts 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 Clinical Nurse Specialist. 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).
Katharine Larsson, PHD, RN, CS appears in the CMS NPPES registry as a Psychiatric/Mental Health Clinical Nurse Specialist provider holding PHD, RN, CS credentials at 1101 BEACON ST STE 2, Brookline, MA, 02446, with a listed phone of (617) 608-0061. NPI 1790817732 was issued on 03/12/2007.
Medicare Part D records for calendar year 2023 show 180 prescription claims written by this provider, covering 19 Medicare beneficiaries and totaling roughly $10K in drug spend.
Psychiatric/Mental Health Clinical Nurse Specialist is a narrow specialty nationwide, with 978 enrolled providers across 50 states and an average of 1,050 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 | 1790817732 |
|---|---|
| Specialty | Psychiatric/Mental Health Clinical Nurse Specialist |
| Credentials | PHD, RN, CS |
| Gender | Female |
| NPI Issued | 03/12/2007 |
License & disciplinary context - Massachusetts BORIM 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~38K Massachusetts medical licensees in 2023 - they are NOT specific to Katharine Larsson, PHD, RN, CS. To verify Katharine Larsson, PHD, RN, CS's current license status, search the BORIM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
80
Total board actions, Massachusetts 2023
Across 78 cases
2.11
Actions per 1,000 licensees
Massachusetts statewide rate
probation
Most common action type
29 cases
BORIM publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Massachusetts disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
180
Total Claims
$10K
Total Drug Cost
19
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 434
- Total Day Supply
- 12,880
- Brand Drug Cost
- $0
- Generic Drug Cost
- $10K
Patient Demographics
- Average Patient Age
- 72.5 years
- Avg HCC Risk Score
- 0.80
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Katharine Larsson, PHD, RN, CS prescribes most
Top Medicare Part D drugs by claim count, 2023
- Sertraline Hcl
Sertraline Hcl
22 claims
- Gabapentin
Gabapentin
20 claims
- Methylphenidate Hcl
Methylphenidate Hcl
14 claims
- Bupropion Xl
Bupropion Xl
13 claims
- Escitalopram Oxalate
Escitalopram Oxalate
12 claims
| Drug | Claims |
|---|---|
| Sertraline Hcl | 22 |
| Gabapentin | 20 |
| Methylphenidate Hcl | 14 |
| Bupropion Xl Bupropion Hcl | 13 |
| Escitalopram Oxalate | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Psychiatric/Mental Health Clinical Nurse Specialist in MA →
All providers in Massachusetts →
Compare specialties →
Psychiatric/Mental Health Clinical Nurse Specialist Overview
How Katharine Larsson, PHD, RN, CS fits within the Psychiatric/Mental Health Clinical Nurse Specialist landscape nationally.
978
Psychiatric/Mental Health Clinical Nurse Specialist Providers in US
50
States with Psychiatric/Mental Health Clinical Nurse Specialist
1,050
Avg Claims per Provider
Katharine Larsson, PHD, RN, CS's 180 claims are below the specialty average of 1,050.
Nearby Psychiatric/Mental Health Clinical Nurse Specialist Providers in Massachusetts
Other clinicians with the same primary specialty enrolled in Massachusetts, drawn from the same CMS NPPES roster as Larsson.
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 Massachusetts medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Psychiatric/Mental Health Clinical Nurse Specialist 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.
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Frequently Asked Questions
What is Katharine Larsson, PHD, RN, CS's specialty? ▼
Katharine Larsson, PHD, RN, CS specializes in Psychiatric/Mental Health Clinical Nurse Specialist and practices in Brookline, Massachusetts. Credentials: PHD, RN, CS.
How much does Katharine Larsson, PHD, RN, CS prescribe under Medicare Part D? ▼
In 2023, Katharine Larsson, PHD, RN, CS wrote 180 Medicare Part D claims totaling $10K in drug costs for 19 beneficiaries.
Where is Katharine Larsson, PHD, RN, CS located? ▼
Katharine Larsson, PHD, RN, CS is located at 1101 BEACON ST STE 2, Brookline, MA, 02446. Phone: (617) 608-0061.
What is Katharine Larsson, PHD, RN, CS's NPI number? ▼
Katharine Larsson, PHD, RN, CS's National Provider Identifier (NPI) is 1790817732, issued on 03/12/2007.
How many Psychiatric/Mental Health Clinical Nurse Specialist providers are there in the US? ▼
There are 978 Psychiatric/Mental Health Clinical Nurse Specialist providers across 50 states in the US. The average Psychiatric/Mental Health Clinical Nurse Specialist provider writes 1,050 Medicare Part D claims per year.
What drugs does Katharine Larsson, PHD, RN, CS prescribe most often? ▼
Based on 2023 Medicare Part D data, Katharine Larsson, PHD, RN, CS's most frequently prescribed drugs include Sertraline Hcl, Gabapentin, Methylphenidate Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Katharine Larsson, PHD, RN, CS accept Medicare? ▼
Katharine Larsson, PHD, RN, CS appears in CMS Medicare data with 180 Part D claims and 19 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Katharine Larsson, PHD, RN, CS's credentials? ▼
Katharine Larsson, PHD, RN, CS's NPI is 1790817732 with credentials PHD, RN, CS. 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.