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2026 NPPES data Addiction Medicine (Internal Medicine) Physician NPI 1073926929 MD
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Sarah Messmer, MD

Addiction Medicine (Internal Medicine) Physician in Chicago, Illinois.

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
19
Medicare Part D claims · Addiction Medicine (Internal Medicine) Physician avg: 1K
MIPS score
87.1/100
▲ 4 pts above national avg 83.5 · Above neutral
Verify NPI on CMS Methodology
Compiled from official public sources by the editorial process.

What the federal data shows

Sarah Messmer, MD reported a CMS MIPS final score of 87.1/100 - above the 83.5 national average - and filed 19 Medicare Part D claims in 2023.

87.1/100
MIPS score · +4 vs avg
19
Part D claims, 2023
Likely
board-certified (heuristic)
≥52nd
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.

CMS NPPES provider registry desk

NPI 1073926929 · Addiction Medicine (Internal Medicine) Physician

NPI-10 · ENUM-MID · TAX-NARROW · MIPS-ABOVE · RX-TRACE · BOOK-THIN · PHOTO-FINISH

  • NPI-10 1073926929
  • ENUM-MID 2014
  • TAX-NARROW 553
  • MIPS-ABOVE 87.1/100
  • RX-TRACE 19
  • BOOK-THIN 19 in Illinois
  • PHOTO-FINISH Gary Denny · ±0.2

MIPS final-score neighbourhood

Same-specialty nationwide peers by CMS final score, not geographic proximity

MIPS pts

What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).

Source CMS Quality Payment Program (MIPS) As of 2023

Sarah Messmer, MD'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.

87 ≥ 52nd percentile 52% 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%). Below this entry. 80–90: 129,887 measured providers (29%). This entry sits in this band. 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 Sarah Messmer, MD 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, Sarah Messmer, MD writes more Part D claims than 1% of them and scores higher on MIPS quality than 47% - 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: 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: 5 · MIPS quality, percentile: 13Point, 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: 97Sarah Messmer, MD, Part D claim volume, percentile in specialty: 1 · MIPS quality, percentile: 47
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 Sarah Messmer, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.

✓
Board certification likely (heuristic, not verified)

Sarah Messmer, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 Sarah Messmer, MD?

High performer (top quartile)

NPI registry status

Active

Issued 06/09/2014

NPI 1073926929

Primary specialty

Addiction Medicine (Internal Medicine) Physician

Niche

553 US NPIs in this specialty

Medicare Part D claims

19 99% vs specialty avg

2023 prescription claims

Specialty avg: 1,403

MIPS final score

87.1/100 3.6 pts vs avg

Above neutral band

vs 83.5 national avg

Specialty distribution in Illinois

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

Illinois providers
Clinical Social Worker5.2%Physical Therapist5%Mental Health Counselor4.5%Speech-Language Pathologist4.2%Student in an Organized Heal…4.2%Pharmacist4.1%Addiction Medicine (Internal…0%
Largest specialties in Illinois (% of in-state providers)

Medicare quality performance, MIPS

Sarah Messmer, MD's 2023 MIPS final score plotted against the Addiction Medicine (Internal Medicine) Physician national average

High performer (top quartile)
MIPS Final Score
87.1/100
vs 83.5 national avg · 2023 performance year
0%100%National avg84%87.1%
MIPS final score (Addiction Medicine (Internal Medicine) Physician) - 87.1/100 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).

Practice Address

840 S WOOD ST
Chicago, IL 60612
(312) 996-4242

Provider Details

NPI 1073926929
Specialty Addiction Medicine (Internal Medicine) Physician
Credentials MD
Gender Female
NPI Issued 06/09/2014

CMS Quality Score (MIPS)

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

87.0887
Final Score
Measured-score avg: 83.5
70.7998
Quality
52.8291
Cost
100
Promoting Interoperability

Reporting: Group practice

License & disciplinary context - Illinois IDFPR 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 ~42K Illinois medical licensees in 2023 - they are NOT specific to Sarah Messmer, MD. To verify Sarah Messmer, MD's current license status, search the IDFPR public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.

106
Total board actions, Illinois 2023
Across 103 cases
2.52
Actions per 1,000 licensees
Illinois statewide rate
probation
Most common action type
38 cases

IDFPR 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 Illinois 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.

19
Total Claims
$650
Total Drug Cost
N/A
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
34
Total Day Supply
914
Generic Drug Cost
$598

Patient Demographics

Average Patient Age
66.6 years
Avg HCC Risk Score
2.01
More Addiction Medicine (Internal Medicine) Physician in IL → All providers in Illinois → Compare specialties →

Addiction Medicine (Internal Medicine) Physician Overview

How Sarah Messmer, MD 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

Sarah Messmer, MD's 19 claims are below the specialty average of 1,403.

Nationwide Addiction Medicine (Internal Medicine) Physician peers with similar MIPS or enrollment year

Two federal-record peer sets for Messmer, both outside Illinois so the neighborhoods are not geographic containment.

Similar MIPS final score

Nearest same-specialty clinicians by CMS MIPS final score (87.1 here).

Gary Denny 86.9 OK Pamela Shultz 87.6 MN Casey Ferguson 87.8 OR Kumar Vasudevan 86.1 CA

Same NPPES enumeration year (2014)

Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.

Ilana Hull Pittsburgh, PA Hishita Parikh Wauwatosa, WI Brian Rasmussen Cincinnati, OH Richard Abitria Kings Bay, GA

Nearby Addiction Medicine (Internal Medicine) Physician Providers in Illinois

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

One of 19 Addiction Medicine (Internal Medicine) Physician providers enrolled in Illinois, 5 are shown here.

Dr. Janene Berli
MD
Chicago, IL
Dr. Dianne Collins
M.D.
Chicago, IL
Dr. Judith Cothran
MD
Skokie, IL
Amanda Donald
Palos Heights, IL
Dr. Sahar Eftekhar
D.O
Chicago, IL

Compare Addiction Medicine (Internal Medicine) Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is Sarah Messmer, MD's specialty? ▼
Sarah Messmer, MD specializes in Addiction Medicine (Internal Medicine) Physician and practices in Chicago, Illinois. Credentials: MD.
How much does Sarah Messmer, MD prescribe under Medicare Part D? ▼
In 2023, Sarah Messmer, MD wrote 19 Medicare Part D claims totaling $650 in drug costs for N/A beneficiaries.
What is Sarah Messmer, MD's Medicare quality score? ▼
Sarah Messmer, MD has a CMS MIPS Final Score of 87.1/100 (Quality: 70.8, Cost: 52.8). 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 Sarah Messmer, MD located? ▼
Sarah Messmer, MD is located at 840 S WOOD ST, Chicago, IL, 60612. Phone: (312) 996-4242.
What is Sarah Messmer, MD's NPI number? ▼
Sarah Messmer, MD's National Provider Identifier (NPI) is 1073926929, issued on 06/09/2014.
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 Sarah Messmer, MD accept Medicare? ▼
Sarah Messmer, MD appears in CMS Medicare data with 19 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 Sarah Messmer, MD's credentials? ▼
Sarah Messmer, MD's NPI is 1073926929 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

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.