NPI registry status
Active
2026 NPPES data Gastroenterology Physician NPI 1619921673 MD
Verify on CMS → Donald Gerhardt, MD
Gastroenterology Physician in Columbia, Missouri.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 16,601 in Gastroenterology 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
542
Medicare Part D claims · 129 beneficiaries · Gastroenterology Physician avg: 833
Generic prescribing
88%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
75/100
▼ 8 pts below national avg 83.1 · Above neutral
Industry payments
$20.35
1 payments · CMS Open Payments (Sunshine Act)
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
Donald Gerhardt, MD reported a CMS MIPS final score of 75/100 - below the 83.1 national average - and filed 542 Medicare Part D claims in 2023.
- 75/100
- MIPS score · -8 vs avg
- 542
- Part D claims, 2023
- 88%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Donald Gerhardt, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
75 15th percentile higher than 15% of 477,587 scored providers
Each bar is a band; taller bars hold more scored 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.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Donald Gerhardt, MD sits
This provider among gastroenterology physician peers
Across the 5,957 gastroenterology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Donald Gerhardt, MD writes more Part D claims than 35% of them and scores higher on MIPS quality than 12% - placing this provider in the lower-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one gastroenterology physician peer from a representative sample of 60; the gold marker is Donald Gerhardt, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Donald Gerhardt, MD 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 Donald Gerhardt, MD?
Below national averagePrimary specialty
Gastroenterology Physician
Medicare Part D claims
542 35% vs specialty avg
MIPS final score
75/100 8.1 pts vs avg
Specialty distribution in Missouri
How Gastroenterology Physician compares to other specialties among Missouri providers
Medicare quality performance, MIPS
Donald Gerhardt, MD's 2023 MIPS final score plotted against the Gastroenterology Physician national average
- MIPS Final Score
- 75/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Gastroenterology Physician) - 75/100 vs national avg 83.1
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).
Donald Gerhardt, MD appears in the CMS NPPES registry as a Gastroenterology Physician provider holding MD credentials at 210 PORTLAND ST STE 100, Columbia, MO, 65201, with a listed phone of (573) 777-8818. NPI 1619921673 was issued on 05/22/2006.
Medicare Part D records for calendar year 2023 show 542 prescription claims written by this provider, covering 129 Medicare beneficiaries and totaling roughly $169K in drug spend, split 12% brand-name and 88% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 75/100 for the 2023 performance year, compared with the national average of 83.1.
Gastroenterology Physician is a mid-sized specialty nationwide, with 16,601 enrolled providers across 54 states and an average of 833 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 | 1619921673 |
|---|---|
| Specialty | Gastroenterology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 05/22/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
75
Final Score
Avg: 83.1
Reporting: Group practice
Hospital and facility affiliations
Facilities where Donald Gerhardt, MD 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.
Gastrointestinal Associates, LLC
Columbia, MO
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Donald Gerhardt, MD. Source: openpaymentsdata.cms.gov.
Total received
$20
Largest payer
Mauna Kea Technologies, Inc.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
Brand vs generic prescribing mix · Typical
Donald Gerhardt, MD - brand share 12.0%
Gastroenterology Physician average
12% brand-name claims vs 88% generic, on 542 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.
542
Total Claims
$169K
Total Drug Cost
129
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,075
- Total Day Supply
- 31,816
- Brand vs Generic
- 12% brand / 88% generic
- Brand Drug Cost
- $100K
- Generic Drug Cost
- $69K
Patient Demographics
- Average Patient Age
- 74.7 years
- Avg HCC Risk Score
- 0.99
- Gender Split
- 59% female / 41% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Donald Gerhardt, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Omeprazole
Omeprazole
205 claims
- Mesalamine 55
Mesalamine
55 claims
- Balsalazide Disodium 46
Balsalazide Disodium
46 claims
- Pantoprazole Sodium 28
Pantoprazole Sodium
28 claims
- Linzess 24
Linzess
24 claims
- Creon 19
Creon
19 claims
- Sulfasalazine 18
Sulfasalazine
18 claims
- Cholestyramine 15
Cholestyramine
15 claims
| Drug | Claims |
|---|---|
| Omeprazole | 205 |
| Mesalamine | 55 |
| Balsalazide Disodium | 46 |
| Pantoprazole Sodium | 28 |
| Linzess Linaclotide | 24 |
| Creon Lipase/Protease/Amylase | 19 |
| Sulfasalazine | 18 |
| Cholestyramine Cholestyramine (With Sugar) | 15 |
| Imipramine Hcl | 14 |
| Prednisone | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gastroenterology Physician Overview
How Donald Gerhardt, MD fits within the Gastroenterology Physician landscape nationally.
16,601
Gastroenterology Physician Providers in US
54
States with Gastroenterology Physician
833
Avg Claims per Provider
Donald Gerhardt, MD's 542 claims are below the specialty average of 833.
Nearby Gastroenterology Physician Providers in Missouri
Other clinicians with the same primary specialty enrolled in Missouri, drawn from the same CMS NPPES roster as Gerhardt.
Dr. Ma'n Abdullah
MD
Columbia, MO
Dr. Kelsey Able
DO
Kansas City, MO
Dr. Barry Abramson
M.D.
Saint Louis, MO
Dr. Tarek Abu-Rajab Tamimi
M.D.
Kansas City, MO
Dr. Aireen-Ronalda Agulto
MD
Saint Louis, MO
Compare Gastroenterology 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 Missouri medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Gastroenterology 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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Medical Specialties Explained
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How insurance networks affect your costs
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Frequently Asked Questions
What is Donald Gerhardt, MD's specialty? ▼
Donald Gerhardt, MD specializes in Gastroenterology Physician and practices in Columbia, Missouri. Credentials: MD.
How much does Donald Gerhardt, MD prescribe under Medicare Part D? ▼
In 2023, Donald Gerhardt, MD wrote 542 Medicare Part D claims totaling $169K in drug costs for 129 beneficiaries.
What is Donald Gerhardt, MD's Medicare quality score? ▼
Donald Gerhardt, MD has a CMS MIPS Final Score of 75/100. The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Donald Gerhardt, MD located? ▼
Donald Gerhardt, MD is located at 210 PORTLAND ST STE 100, Columbia, MO, 65201. Phone: (573) 777-8818.
What is Donald Gerhardt, MD's NPI number? ▼
Donald Gerhardt, MD's National Provider Identifier (NPI) is 1619921673, issued on 05/22/2006.
Does Donald Gerhardt, MD prescribe more brand-name or generic drugs? ▼
Donald Gerhardt, MD's prescribing is 12% brand-name and 88% generic drugs by claim count, with $100K in brand drug costs.
How many Gastroenterology Physician providers are there in the US? ▼
There are 16,601 Gastroenterology Physician providers across 54 states in the US. The average Gastroenterology Physician provider writes 833 Medicare Part D claims per year.
What drugs does Donald Gerhardt, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Donald Gerhardt, MD's most frequently prescribed drugs include Omeprazole, Mesalamine, Balsalazide Disodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Donald Gerhardt, MD accept Medicare? ▼
Donald Gerhardt, MD appears in CMS Medicare data with 542 Part D claims and 129 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Donald Gerhardt, MD's credentials? ▼
Donald Gerhardt, MD's NPI is 1619921673 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 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.