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2026 NPPES data Addiction Medicine (Internal Medicine) Physician NPI 1629431796
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William Garneau

Addiction Medicine (Internal Medicine) Physician in Baltimore, 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 553 in Addiction Medicine (Internal Medicine) 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
34
Medicare Part D claims · Addiction Medicine (Internal Medicine) Physician avg: 1K
MIPS score
74.4/100
▼ 9 pts below national avg 83.5 · Mid-tier
Verify NPI on CMS Methodology
Compiled from official public sources by the editorial process.

What the federal data shows

William Garneau reported a CMS MIPS final score of 74.4/100 - below the 83.5 national average - and filed 34 Medicare Part D claims in 2023.

74.4/100
MIPS score · -9 vs avg
34
Part D claims, 2023
Likely
board-certified (heuristic)
≥13th
pct among measured MIPS (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.

William Garneau's MIPS score vs every measured U.S. clinician

CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.

74 ≥ 13th percentile 13% of 454,083 measured providers are in lower value bands

0–10: 8,684 measured providers (2%). Below this entry. 10–20: 3,008 measured providers (1%). Below this entry. 20–30: 3,069 measured providers (1%). Below this entry. 30–40: 2,746 measured providers (1%). Below this entry. 40–50: 2,928 measured providers (1%). Below this entry. 50–60: 5,882 measured providers (1%). Below this entry. 60–70: 13,906 measured providers (3%). Below this entry. 70–80: 94,570 measured providers (21%). This entry sits in this band. 80–90: 129,887 measured providers (29%). Above this entry. 90+: 189,403 measured providers (42%). Above this entry. This provider 0 100 every measured MIPS clinician, bucketed by value

Each bar is a band; taller bars hold more measured providers. 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 whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.

Source CMS Merit-based Incentive Payment System (MIPS) · 2023

Where William Garneau sits

This provider among addiction medicine (internal medicine) physician peers

Across the 72 addiction medicine (internal medicine) physician providers who report both Medicare Part D prescribing and a MIPS quality score, William Garneau writes more Part D claims than 4% of them and scores higher on MIPS quality than 13% - placing this provider in the lower-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.

Lower volume · High qualityHigh volume · High qualityLower volume · Lower qualityHigh volume · Lower quality02550751000255075100Part D claim volume, percentile in specialtyMIPS quality, percentilePoint, Part D claim volume, percentile in specialty: 83 · MIPS quality, percentile: 72Point, Part D claim volume, percentile in specialty: 13 · MIPS quality, percentile: 83Point, Part D claim volume, percentile in specialty: 85 · MIPS quality, percentile: 77Point, Part D claim volume, percentile in specialty: 62 · MIPS quality, percentile: 2Point, Part D claim volume, percentile in specialty: 82 · MIPS quality, percentile: 15Point, Part D claim volume, percentile in specialty: 2 · MIPS quality, percentile: 52Point, Part D claim volume, percentile in specialty: 52 · MIPS quality, percentile: 22Point, Part D claim volume, percentile in specialty: 42 · MIPS quality, percentile: 73Point, Part D claim volume, percentile in specialty: 27 · MIPS quality, percentile: 83Point, Part D claim volume, percentile in specialty: 32 · MIPS quality, percentile: 58Point, Part D claim volume, percentile in specialty: 0 · MIPS quality, percentile: 22Point, Part D claim volume, percentile in specialty: 17 · MIPS quality, percentile: 40Point, Part D claim volume, percentile in specialty: 53 · MIPS quality, percentile: 57Point, Part D claim volume, percentile in specialty: 33 · MIPS quality, percentile: 22Point, Part D claim volume, percentile in specialty: 67 · MIPS quality, percentile: 8Point, Part D claim volume, percentile in specialty: 8 · MIPS quality, percentile: 20Point, Part D claim volume, percentile in specialty: 92 · MIPS quality, percentile: 63Point, Part D claim volume, percentile in specialty: 93 · MIPS quality, percentile: 80Point, Part D claim volume, percentile in specialty: 25 · MIPS quality, percentile: 83Point, Part D claim volume, percentile in specialty: 98 · MIPS quality, percentile: 97Point, Part D claim volume, percentile in specialty: 28 · MIPS quality, percentile: 35Point, Part D claim volume, percentile in specialty: 18 · MIPS quality, percentile: 83Point, Part D claim volume, percentile in specialty: 7 · MIPS quality, percentile: 32Point, Part D claim volume, percentile in specialty: 35 · MIPS quality, percentile: 48Point, Part D claim volume, percentile in specialty: 55 · MIPS quality, percentile: 40Point, Part D claim volume, percentile in specialty: 47 · MIPS quality, percentile: 65Point, Part D claim volume, percentile in specialty: 38 · MIPS quality, percentile: 22Point, Part D claim volume, percentile in specialty: 78 · MIPS quality, percentile: 33Point, Part D claim volume, percentile in specialty: 3 · MIPS quality, percentile: 15Point, Part D claim volume, percentile in specialty: 75 · MIPS quality, percentile: 73Point, Part D claim volume, percentile in specialty: 48 · MIPS quality, percentile: 5Point, Part D claim volume, percentile in specialty: 60 · MIPS quality, percentile: 55Point, Part D claim volume, percentile in specialty: 90 · MIPS quality, percentile: 58Point, Part D claim volume, percentile in specialty: 30 · MIPS quality, percentile: 97Point, Part D claim volume, percentile in specialty: 43 · MIPS quality, percentile: 22Point, Part D claim volume, percentile in specialty: 87 · MIPS quality, percentile: 78Point, Part D claim volume, percentile in specialty: 95 · MIPS quality, percentile: 92Point, Part D claim volume, percentile in specialty: 22 · MIPS quality, percentile: 5Point, Part D claim volume, percentile in specialty: 37 · MIPS quality, percentile: 90Point, Part D claim volume, percentile in specialty: 57 · MIPS quality, percentile: 50Point, Part D claim volume, percentile in specialty: 10 · MIPS quality, percentile: 80Point, Part D claim volume, percentile in specialty: 65 · MIPS quality, percentile: 47Point, Part D claim volume, percentile in specialty: 18 · MIPS quality, percentile: 70Point, Part D claim volume, percentile in specialty: 12 · MIPS quality, percentile: 12Point, Part D claim volume, percentile in specialty: 73 · MIPS quality, percentile: 10Point, Part D claim volume, percentile in specialty: 88 · MIPS quality, percentile: 0Point, Part D claim volume, percentile in specialty: 45 · MIPS quality, percentile: 30Point, Part D claim volume, percentile in specialty: 13 · MIPS quality, percentile: 93Point, Part D claim volume, percentile in specialty: 50 · MIPS quality, percentile: 58Point, Part D claim volume, percentile in specialty: 40 · MIPS quality, percentile: 52Point, Part D claim volume, percentile in specialty: 77 · MIPS quality, percentile: 68Point, Part D claim volume, percentile in specialty: 68 · MIPS quality, percentile: 3Point, Part D claim volume, percentile in specialty: 58 · MIPS quality, percentile: 18Point, Part D claim volume, percentile in specialty: 23 · MIPS quality, percentile: 37Point, Part D claim volume, percentile in specialty: 72 · MIPS quality, percentile: 43Point, Part D claim volume, percentile in specialty: 97 · MIPS quality, percentile: 45Point, Part D claim volume, percentile in specialty: 63 · MIPS quality, percentile: 38Point, Part D claim volume, percentile in specialty: 100 · MIPS quality, percentile: 95Point, Part D claim volume, percentile in specialty: 80 · MIPS quality, percentile: 65Point, Part D claim volume, percentile in specialty: 70 · MIPS quality, percentile: 97William Garneau, Part D claim volume, percentile in specialty: 4 · MIPS quality, percentile: 13
Part D claim volume vs MIPS quality, by specialty percentile

Each dot is one addiction medicine (internal medicine) physician peer from a representative sample of 60; the gold marker is William Garneau. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.

✓
Board certification likely (heuristic, not verified)

William Garneau practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).

What does the federal data show about William Garneau?

Below national average

NPI registry status

Active

Issued 04/05/2016

NPI 1629431796

Primary specialty

Addiction Medicine (Internal Medicine) Physician

Niche

553 US NPIs in this specialty

Medicare Part D claims

34 98% vs specialty avg

2023 prescription claims

Specialty avg: 1,403

MIPS final score

74.4/100 9.1 pts vs avg

Mid-tier band

vs 83.5 national avg

Specialty distribution in Maryland

How Addiction Medicine (Internal Medicine) Physician compares to other specialties among Maryland providers

Maryland providers
Behavior Technician14.1%Clinical Social Worker5.5%Student in an Organized Heal…4.5%Home Health Aide4.4%Physical Therapist3.9%Pharmacist3.6%Addiction Medicine (Internal…0%
Largest specialties in Maryland (% of in-state providers)

Medicare quality performance, MIPS

William Garneau's 2023 MIPS final score plotted against the Addiction Medicine (Internal Medicine) Physician national average

Below national average
MIPS Final Score
74.4/100
vs 83.5 national avg · 2023 performance year
0%100%National avg84%74.4%
MIPS final score (Addiction Medicine (Internal Medicine) Physician) - 74.4/100 vs national avg 83.5
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).

William Garneau appears in the CMS NPPES registry as an Addiction Medicine (Internal Medicine) Physician provider at 600 N WOLFE ST, Baltimore, MD, 21287, with a listed phone of (410) 955-5000. NPI 1629431796 was issued on 04/05/2016.

Medicare Part D records for calendar year 2023 show 34 prescription claims written by this provider, covering N/A Medicare beneficiaries and totaling roughly $4K in drug spend. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 74.4/100 for the 2023 performance year (Quality 64.7, Cost 52.4), compared with the 83.5 average among clinicians with a measured score.

Addiction Medicine (Internal Medicine) Physician is a narrow specialty nationwide, with 553 enrolled providers across 46 states and an average of 1,403 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

600 N WOLFE ST
Baltimore, MD 21287
(410) 955-5000

Provider Details

NPI 1629431796
Specialty Addiction Medicine (Internal Medicine) Physician
Gender Male
NPI Issued 04/05/2016

CMS Quality Score (MIPS)

Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.

74.3962
Final Score
Measured-score avg: 83.5
64.7185
Quality
52.4354
Cost
97
Promoting Interoperability

Reporting: Group practice

Hospital and facility affiliations

Facilities where William Garneau 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.

Johns Hopkins University
Baltimore, MD

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.

34
Total Claims
$4K
Total Drug Cost
N/A
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
36
Total Day Supply
893
Generic Drug Cost
$1K

Patient Demographics

Average Patient Age
69.7 years
Avg HCC Risk Score
2.25
More Addiction Medicine (Internal Medicine) Physician in MD → All providers in Maryland → Compare specialties →

Addiction Medicine (Internal Medicine) Physician Overview

How William Garneau fits within the Addiction Medicine (Internal Medicine) Physician landscape nationally.

553
Addiction Medicine (Internal Medicine) Physician Providers in US
46
States with Addiction Medicine (Internal Medicine) Physician
1,403
Avg Claims per Provider

William Garneau's 34 claims are below the specialty average of 1,403.

Nearby Addiction Medicine (Internal Medicine) Physician Providers in Maryland

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

One of 14 Addiction Medicine (Internal Medicine) Physician providers enrolled in Maryland, 5 are shown here.

Dr. Lisa Boynes Sindass
MD
Greenbelt, MD
Dr. Nurul Chowdhury
M.D.
Kensington, MD
Dr. Howard Cohen
MD
Baltimore, MD
Dr. Fidelis Define
MD
Towson, MD
Dr. John Robyn Diez
MD
Oakland, MD

Compare Addiction Medicine (Internal Medicine) 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 Addiction Medicine (Internal Medicine) 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.

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Frequently Asked Questions

What is William Garneau's specialty? ▼
William Garneau specializes in Addiction Medicine (Internal Medicine) Physician and practices in Baltimore, Maryland.
How much does William Garneau prescribe under Medicare Part D? ▼
In 2023, William Garneau wrote 34 Medicare Part D claims totaling $4K in drug costs for N/A beneficiaries.
What is William Garneau's Medicare quality score? ▼
William Garneau has a CMS MIPS Final Score of 74.4/100 (Quality: 64.7, Cost: 52.4). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is William Garneau located? ▼
William Garneau is located at 600 N WOLFE ST, Baltimore, MD, 21287. Phone: (410) 955-5000.
What is William Garneau's NPI number? ▼
William Garneau's National Provider Identifier (NPI) is 1629431796, issued on 04/05/2016.
How many Addiction Medicine (Internal Medicine) Physician providers are there in the US? ▼
There are 553 Addiction Medicine (Internal Medicine) Physician providers across 46 states in the US. The average Addiction Medicine (Internal Medicine) Physician provider writes 1,403 Medicare Part D claims per year.
Does William Garneau accept Medicare? ▼
William Garneau appears in CMS Medicare data with 34 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 William Garneau's credentials? ▼
William Garneau's NPI is 1629431796. 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.
Quality Performance
CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
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 editorial process.

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.