NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1255310850 D.O.
Verify on CMS → David Knorr, D.O.
Family Medicine Physician in Palmyra, 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 150,125 in Family 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
14K
Medicare Part D claims · 729 beneficiaries · Family Medicine Physician avg: 4K
Generic prescribing
88%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$932.81
60 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
David Knorr, D.O. filed 13,776 Medicare Part D claims in 2024 as a Family Medicine Physician in Palmyra, Missouri, prescribing 88% generic.
- 14K
- Part D claims, 2024
- 88%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥98th
- pct by Part D claim volume (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.
Federal trust snapshot
What official records show about David Knorr, D.O.
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1255310850), first enumerated 01/11/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 13,776 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$932.81 in reported industry payments (60 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1255310850 · Family Medicine Physician
NPI-10 · ENUM-LEGACY · TAX-MEGA · RX-HEAVY · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1255310850
- ENUM-LEGACY 2006
- TAX-MEGA 150K Family Medicine
- RX-HEAVY 14K claims
- BOOK-LIGHT 2,920 in Missouri
- PHOTO-ENUM John Hubbard · 2006
David Knorr, D.O.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
13,776 ≥ 98th percentile 98% of 1,416,883 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
✓
Board certification likely (heuristic, not verified)
David Knorr, D.O. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 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 David Knorr, D.O.?
Quality data not reportedPrimary specialty
Family Medicine Physician
Medicare Part D claims
13,776 291% vs specialty avg
Specialty distribution in Missouri
How Family Medicine Physician compares to other specialties among Missouri 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 Family Medicine Physician. 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).
Practice Address
Provider Details
| NPI | 1255310850 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | D.O. |
| Gender | Male |
| NPI Issued | 01/11/2006 |
Hospital and facility affiliations
Facilities where David Knorr, D.O. 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.
Blessing Hospital
Hannibal, 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 David Knorr, D.O.. Source: openpaymentsdata.cms.gov.
Total received
$933
Largest payer
AstraZeneca Pharmaceuticals LP
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
David Knorr, D.O. - brand share 12.0%
Family Medicine Physician average
12% brand-name claims vs 88% generic, on 13,776 2024 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 2024.
13,776
Total Claims
$1.1M
Total Drug Cost
729
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 22,921.133
- Total Day Supply
- 657,328
- Brand vs Generic
- 12% brand / 88% generic
- Brand Drug Cost
- $906K
- Generic Drug Cost
- $177K
- Opioid Claims
- 896 (6.5% rate)
- Antibiotic Claims
- 197
Patient Demographics
- Average Patient Age
- 70.8 years
- Avg HCC Risk Score
- 1.11
- Gender Split
- 53% female / 47% male
- Age Distribution
- <65: 109, 65-74: 377, 75-84: 194, 85+: 49
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What David Knorr, D.O. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
543 claims
- Lisinopril
Lisinopril
510 claims
- Atorvastatin Calcium
Atorvastatin Calcium
490 claims
- Amlodipine Besylate
Amlodipine Besylate
386 claims
- Metoprolol Succinate
Metoprolol Succinate
372 claims
- Levothyroxine Sodium
Levothyroxine Sodium
353 claims
- Metformin Hcl
Metformin Hcl
349 claims
- Omeprazole
Omeprazole
337 claims
| Drug | Claims |
|---|---|
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 543 |
| Lisinopril | 510 |
| Atorvastatin Calcium | 490 |
| Amlodipine Besylate | 386 |
| Metoprolol Succinate | 372 |
| Levothyroxine Sodium | 353 |
| Metformin Hcl | 349 |
| Omeprazole | 337 |
| Rosuvastatin Calcium | 319 |
| Gabapentin | 286 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Family Medicine Physician Overview
How David Knorr, D.O. fits within the Family Medicine Physician landscape nationally.
150,125
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,519
Avg Claims per Provider
David Knorr, D.O.'s 13,776 claims are above the specialty average of 3,519.
Nationwide Family Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Knorr, both outside Missouri so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Family Medicine Physician Providers in Missouri
Other clinicians with the same primary specialty enrolled in Missouri, drawn from the same CMS NPPES roster as Knorr.
One of 2,920 Family Medicine Physician providers enrolled in Missouri, 5 are shown here.
Dr. Mohammad Abbas
DO
Kirksville, MO
Dr. Karam Abdelmasih
MD, AP
Festus, MO
Dr. Afsheen Abdullah Patel
MD
Lees Summit, MO
Dr. Christopher Abercrombie
DO
Arnold, MO
Dr. Avery Abernathy
D.O.
Kansas City, MO
Compare Family Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is David Knorr, D.O.'s specialty? ▼
David Knorr, D.O. specializes in Family Medicine Physician and practices in Palmyra, Missouri. Credentials: D.O..
How much does David Knorr, D.O. prescribe under Medicare Part D? ▼
In 2024, David Knorr, D.O. wrote 13,776 Medicare Part D claims totaling $1.1M in drug costs for 729 beneficiaries.
Where is David Knorr, D.O. located? ▼
David Knorr, D.O. is located at 1811 S MAIN ST, Palmyra, MO, 63461. Phone: (573) 769-2231.
What is David Knorr, D.O.'s NPI number? ▼
David Knorr, D.O.'s National Provider Identifier (NPI) is 1255310850, issued on 01/11/2006.
Does David Knorr, D.O. prescribe more brand-name or generic drugs? ▼
David Knorr, D.O.'s prescribing is 12% brand-name and 88% generic drugs by claim count, with $906K in brand drug costs.
Does David Knorr, D.O. prescribe opioids? ▼
Yes, David Knorr, D.O. had 896 opioid claims in 2024 with an opioid prescribing rate of 6.5%.
How many Family Medicine Physician providers are there in the US? ▼
There are 150,125 Family Medicine Physician providers across 56 states in the US. The average Family Medicine Physician provider writes 3,519 Medicare Part D claims per year.
What drugs does David Knorr, D.O. prescribe most often? ▼
Based on 2024 Medicare Part D data, David Knorr, D.O.'s most frequently prescribed drugs include Hydrocodone-Acetaminophen, Lisinopril, Atorvastatin Calcium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does David Knorr, D.O. accept Medicare? ▼
David Knorr, D.O. appears in CMS Medicare data with 13,776 Part D claims and 729 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify David Knorr, D.O.'s credentials? ▼
David Knorr, D.O.'s NPI is 1255310850 with credentials D.O.. 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 (2024). 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 August 2026 (NPPES) / 2024 (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
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 August 2026.