2026 NPPES data Forensic Psychiatry Physician NPI 1265056360 MD
Verify on CMS →

Liam Guenther, MD

Forensic Psychiatry Physician in Catonsville, Maryland. This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 841 in Forensic Psychiatry Physician, 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
196
Medicare Part D claims · 39 beneficiaries · Forensic Psychiatry Physician avg: 869
Compiled from official public sources by the PlainDoctor editorial team.

What the federal data shows

Liam Guenther, MD filed 196 Medicare Part D claims in 2023 as a Forensic Psychiatry Physician in Catonsville, Maryland.

196
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.

Liam Guenther, MD's Medicare Part D volume vs every U.S. prescriber

Total Medicare Part D claims, 2023, across all CMS prescribers nationally

196 35th percentile higher than 35% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). This entry sits in this band. 200–400: 182,923 prescribers (13%). Above this entry. 400–600: 90,619 prescribers (7%). Above this entry. 600–800: 56,224 prescribers (4%). Above this entry. 800–1,000: 40,919 prescribers (3%). Above this entry. 1,000–1,200: 31,827 prescribers (2%). Above this entry. 1,200–1,400: 26,224 prescribers (2%). Above this entry. 1,400–1,600: 21,710 prescribers (2%). Above this entry. 1,600–1,800: 19,072 prescribers (1%). Above this entry. 1,800–2,000: 16,451 prescribers (1%). Above this entry. 2K+: 213,991 prescribers (16%). Above this entry. This provider 0 2K+ every Part D prescriber (claims/yr), bucketed by value

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

Board-eligible specialty (heuristic, not verified)

Liam Guenther, MD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).

What does the federal data show about Liam Guenther, MD?

Quality data not reported

NPI registry status

Active

Issued 06/04/2020

NPI 1265056360

Primary specialty

Forensic Psychiatry Physician

Niche

841 US NPIs in this specialty

Medicare Part D claims

196 77% vs specialty avg

2023 prescription claims

Specialty avg: 869

Specialty distribution in Maryland

How Forensic Psychiatry Physician compares to other specialties among Maryland providers

Maryland providers

Largest specialties in Maryland (% of in-state providers)

Behavior Technician - 14.1%Behavior Technician14.1%Clinical Social Worker - 5.5%Clinical Social Worker5.5%Student in an Organized Health Care Education/Training Program - 4.5%Student in an Organized Health Care Education/Training Program4.5%Home Health Aide - 4.4%Home Health Aide4.4%Physical Therapist - 3.9%Physical Therapist3.9%Pharmacist - 3.6%Pharmacist3.6%Forensic Psychiatry Physician - 0%Forensic Psychiatry Physician0%
Largest specialties in Maryland (% of in-state 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 Forensic Psychiatry Physician. Verify directly:

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).

Liam Guenther, MD appears in the CMS NPPES registry as a Forensic Psychiatry Physician provider holding MD credentials at 55 WADE AVE, Catonsville, MD, 21228, with a listed phone of (410) 402-6000. NPI 1265056360 was issued on 06/04/2020. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what Guenther 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 196 prescription claims written by this provider, covering 39 Medicare beneficiaries and totaling roughly $20K 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.

Forensic Psychiatry Physician is a narrow specialty nationwide, with 841 enrolled providers across 47 states and an average of 869 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

55 WADE AVE
Catonsville, MD 21228

Provider Details

NPI 1265056360
Specialty Forensic Psychiatry Physician
Credentials MD
Gender Male
NPI Issued 06/04/2020

Medicare Part D Prescribing Data

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

196
Total Claims
$20K
Total Drug Cost
39
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
400
Total Day Supply
12,012
Generic Drug Cost
$12K

Patient Demographics

Average Patient Age
56.7 years
Avg HCC Risk Score
1.50
Gender Split
69% female / 31% male

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

Drug Claims
Duloxetine Hcl
13
Trazodone Hcl
13

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

Forensic Psychiatry Physician Overview

How Liam Guenther, MD fits within the Forensic Psychiatry Physician landscape nationally.

841
Forensic Psychiatry Physician Providers in US
47
States with Forensic Psychiatry Physician
869
Avg Claims per Provider

Liam Guenther, MD's 196 claims are below the specialty average of 869.

Nearby Forensic Psychiatry Physician Providers in Maryland

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

Compare Forensic Psychiatry Physician nationally: see state-by-state distribution →

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 Maryland medical board, federal registration is not a license check. Credential verification guide
  • Weigh a second option: compare this provider with a nearby Forensic Psychiatry Physician 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.

Frequently Asked Questions

What is Liam Guenther, MD's specialty?
Liam Guenther, MD specializes in Forensic Psychiatry Physician and practices in Catonsville, Maryland. Credentials: MD.
How much does Liam Guenther, MD prescribe under Medicare Part D?
In 2023, Liam Guenther, MD wrote 196 Medicare Part D claims totaling $20K in drug costs for 39 beneficiaries.
Where is Liam Guenther, MD located?
Liam Guenther, MD is located at 55 WADE AVE, Catonsville, MD, 21228. Phone: (410) 402-6000.
What is Liam Guenther, MD's NPI number?
Liam Guenther, MD's National Provider Identifier (NPI) is 1265056360, issued on 06/04/2020.
How many Forensic Psychiatry Physician providers are there in the US?
There are 841 Forensic Psychiatry Physician providers across 47 states in the US. The average Forensic Psychiatry Physician provider writes 869 Medicare Part D claims per year.
What drugs does Liam Guenther, MD prescribe most often?
Based on 2023 Medicare Part D data, Liam Guenther, MD's most frequently prescribed drugs include Duloxetine Hcl, Trazodone Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Liam Guenther, MD accept Medicare?
Liam Guenther, MD appears in CMS Medicare data with 196 Part D claims and 39 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Liam Guenther, MD's credentials?
Liam Guenther, MD's NPI is 1265056360 with credentials MD. 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

Compiled from official public sources by the PlainDoctor editorial team.