NPI registry status
Active
2026 NPPES data Rheumatology Physician NPI 1750343455 M.D.
Verify on CMS → Ann Warner, M.D.
Rheumatology Physician in Kansas City, 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 6,181 in Rheumatology 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
5K
Medicare Part D claims · 798 beneficiaries · Rheumatology Physician avg: 2K
Generic prescribing
87%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
91.9/100
▲ 9 pts above national avg 83.1 · Exceptional
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
Ann Warner, M.D. reported a CMS MIPS final score of 91.9/100 - above the 83.1 national average - and filed 5,049 Medicare Part D claims in 2023.
- 91.9/100
- MIPS score · +9 vs avg
- 5K
- Part D claims, 2023
- 87%
- 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.
Ann Warner, M.D.'s MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
92 Top 37% higher than 63% 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 Ann Warner, M.D. sits
This provider among rheumatology physician peers
Across the 2,181 rheumatology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Ann Warner, M.D. writes more Part D claims than 90% of them and scores higher on MIPS quality than 67% - placing this provider in the high-volume, high-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 rheumatology physician peer from a representative sample of 60; the gold marker is Ann Warner, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Ann Warner, M.D. 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 Ann Warner, M.D.?
High performer (top quartile)Primary specialty
Rheumatology Physician
Medicare Part D claims
5,049 146% vs specialty avg
MIPS final score
91.9/100 8.8 pts vs avg
Specialty distribution in Missouri
How Rheumatology Physician compares to other specialties among Missouri providers
Medicare quality performance, MIPS
Ann Warner, M.D.'s 2023 MIPS final score plotted against the Rheumatology Physician national average
- MIPS Final Score
- 91.9/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Rheumatology Physician) - 91.9/100 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).
Ann Warner, M.D. appears in the CMS NPPES registry as a Rheumatology Physician provider holding M.D. credentials at 4440 BROADWAY BLVD, Kansas City, MO, 64111, with a listed phone of (816) 531-0930. NPI 1750343455 was issued on 04/06/2006.
Medicare Part D records for calendar year 2023 show 5,049 prescription claims written by this provider, covering 798 Medicare beneficiaries and totaling roughly $2.5 million in drug spend, split 12% brand-name and 87% generic by claim count, with an opioid prescribing rate of 9.4%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 91.9/100 for the 2023 performance year (Quality 75.2), compared with the national average of 83.1.
Rheumatology Physician is a mid-sized specialty nationwide, with 6,181 enrolled providers across 52 states and an average of 2,054 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 | 1750343455 |
|---|---|
| Specialty | Rheumatology Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 04/06/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
91.8902
Final Score
Avg: 83.1
75.1734
Quality
100
Promoting Interoperability
Reporting: Alternative Payment Model
Hospital and facility affiliations
Facilities where Ann Warner, M.D. 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.
Kansas City Physician Partners Inc
Olathe, KS
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Brand vs generic prescribing mix · Typical
Ann Warner, M.D. - brand share 12.0%
Rheumatology Physician average
12% brand-name claims vs 87% generic, on 5,049 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.
5,049
Total Claims
$2.5M
Total Drug Cost
798
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 10,742
- Total Day Supply
- 314,361
- Brand vs Generic
- 12% brand / 87% generic
- Brand Drug Cost
- $2.2M
- Generic Drug Cost
- $205K
- Opioid Claims
- 473 (9.4% rate)
- Antibiotic Claims
- 28
Patient Demographics
- Average Patient Age
- 72.3 years
- Avg HCC Risk Score
- 1.37
- Gender Split
- 78% female / 22% male
- Age Distribution
- <65: 78, 65-74: 426, 75-84: 247, 85+: 47
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Ann Warner, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Hydroxychloroquine…
Hydroxychloroquine Sulfate
1,132 claims
- Methotrexate 429
Methotrexate
429 claims
- Tramadol Hcl 416
Tramadol Hcl
416 claims
- Leflunomide 272
Leflunomide
272 claims
- Prednisone 254
Prednisone
254 claims
- Celecoxib 206
Celecoxib
206 claims
- Gabapentin 195
Gabapentin
195 claims
- Sulfasalazine 187
Sulfasalazine
187 claims
| Drug | Claims |
|---|---|
| Hydroxychloroquine Sulfate | 1,132 |
| Methotrexate Methotrexate Sodium | 429 |
| Tramadol Hcl | 416 |
| Leflunomide | 272 |
| Prednisone | 254 |
| Celecoxib | 206 |
| Gabapentin | 195 |
| Sulfasalazine | 187 |
| Alendronate Sodium | 161 |
| Sulfasalazine Dr Sulfasalazine | 135 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Rheumatology Physician Overview
How Ann Warner, M.D. fits within the Rheumatology Physician landscape nationally.
6,181
Rheumatology Physician Providers in US
52
States with Rheumatology Physician
2,054
Avg Claims per Provider
Ann Warner, M.D.'s 5,049 claims are above the specialty average of 2,054.
Nearby Rheumatology Physician Providers in Missouri
Other clinicians with the same primary specialty enrolled in Missouri, drawn from the same CMS NPPES roster as Warner.
Dr. Zaki Abou Zahr
M.D.
Columbia, MO
Dr. Anam Ahmad
MD
Chesterfield, MO
Dr. Stephen Armstrong
MD
Springfield, MO
Dr. Romila Aslam
M.D.
Bridgeton, MO
Dr. John Atkinson
MD
Saint Louis, MO
Compare Rheumatology 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 Rheumatology 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 Ann Warner, M.D.'s specialty? ▼
Ann Warner, M.D. specializes in Rheumatology Physician and practices in Kansas City, Missouri. Credentials: M.D..
How much does Ann Warner, M.D. prescribe under Medicare Part D? ▼
In 2023, Ann Warner, M.D. wrote 5,049 Medicare Part D claims totaling $2.5M in drug costs for 798 beneficiaries.
What is Ann Warner, M.D.'s Medicare quality score? ▼
Ann Warner, M.D. has a CMS MIPS Final Score of 91.9/100 (Quality: 75.2). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Ann Warner, M.D. located? ▼
Ann Warner, M.D. is located at 4440 BROADWAY BLVD, Kansas City, MO, 64111. Phone: (816) 531-0930.
What is Ann Warner, M.D.'s NPI number? ▼
Ann Warner, M.D.'s National Provider Identifier (NPI) is 1750343455, issued on 04/06/2006.
Does Ann Warner, M.D. prescribe more brand-name or generic drugs? ▼
Ann Warner, M.D.'s prescribing is 12% brand-name and 87% generic drugs by claim count, with $2.2M in brand drug costs.
Does Ann Warner, M.D. prescribe opioids? ▼
Yes, Ann Warner, M.D. had 473 opioid claims in 2023 with an opioid prescribing rate of 9.4%.
How many Rheumatology Physician providers are there in the US? ▼
There are 6,181 Rheumatology Physician providers across 52 states in the US. The average Rheumatology Physician provider writes 2,054 Medicare Part D claims per year.
What drugs does Ann Warner, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Ann Warner, M.D.'s most frequently prescribed drugs include Hydroxychloroquine Sulfate, Methotrexate, Tramadol Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Ann Warner, M.D. accept Medicare? ▼
Ann Warner, M.D. appears in CMS Medicare data with 5,049 Part D claims and 798 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ann Warner, M.D.'s credentials? ▼
Ann Warner, M.D.'s NPI is 1750343455 with credentials M.D.. 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.