NPI registry status
Active
2026 NPPES data Addiction Medicine (Internal Medicine) Physician NPI 1558393637 D.O.
Verify on CMS → Gary Denny, D.O.
Addiction Medicine (Internal Medicine) Physician in Tulsa, Oklahoma.
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
458
Medicare Part D claims · 29 beneficiaries · Addiction Medicine (Internal Medicine) Physician avg: 1K
Generic prescribing
95%
generic claims · 5% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
86.9/100
▲ 3 pts above national avg 83.5 · Above neutral
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Gary Denny, D.O. reported a CMS MIPS final score of 86.9/100 - above the 83.5 national average - and filed 458 Medicare Part D claims in 2023.
- 86.9/100
- MIPS score · +3 vs avg
- 458
- Part D claims, 2023
- 95%
- 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.
CMS NPPES provider registry desk
NPI 1558393637 · Addiction Medicine (Internal Medicine) Physician
NPI-10 · ENUM-LEGACY · TAX-NARROW · MIPS-ABOVE · RX-LIGHT · BOOK-THIN · PHOTO-FINISH
- NPI-10 1558393637
- ENUM-LEGACY 2006
- TAX-NARROW 553
- MIPS-ABOVE 86.9/100
- RX-LIGHT 458
- BOOK-THIN 3 in Oklahoma
- PHOTO-FINISH Sarah Messmer · ±0.2
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Kumar Vasudevan …
Kumar Vasudevan
86.1 MIPS pts
- Denny · this pro…
Denny · this provider
86.9 MIPS pts
- Sarah Messmer · …
Sarah Messmer
87.1 MIPS pts
- Elisabeth Poorma…
Elisabeth Poorman
87.1 MIPS pts
- Pamela Shultz · …
Pamela Shultz
87.6 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Gary Denny, D.O.'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 ≥ 49th percentile 49% of 454,083 measured providers are in lower value bands
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 Gary Denny, D.O. 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, Gary Denny, D.O. writes more Part D claims than 56% of them and scores higher on MIPS quality than 46% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one addiction medicine (internal medicine) physician peer from a representative sample of 60; the gold marker is Gary Denny, D.O.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Gary Denny, D.O. 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 Gary Denny, D.O.?
High performer (top quartile)Primary specialty
Addiction Medicine (Internal Medicine) Physician
Medicare Part D claims
458 67% vs specialty avg
MIPS final score
86.9/100 3.4 pts vs avg
Specialty distribution in Oklahoma
How Addiction Medicine (Internal Medicine) Physician compares to other specialties among Oklahoma providers
Medicare quality performance, MIPS
Gary Denny, D.O.'s 2023 MIPS final score plotted against the Addiction Medicine (Internal Medicine) Physician national average
- MIPS Final Score
- 86.9/100
- vs 83.5 national avg · 2023 performance year
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 | 1558393637 |
|---|---|
| Specialty | Addiction Medicine (Internal Medicine) Physician |
| Credentials | D.O. |
| Gender | Male |
| NPI Issued | 07/07/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
86.8556
Final Score
Measured-score avg: 83.5
70.6959
Quality
59.5905
Cost
99
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Gary Denny, 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.
Oklahoma State University
Tulsa, OK
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 · Generic-heavy
Gary Denny, D.O. - brand share 5.0%
Addiction Medicine (Internal Medicine) Physician average
5% brand-name claims vs 95% generic, on 458 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.
458
Total Claims
$53K
Total Drug Cost
29
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 468
- Total Day Supply
- 13,486
- Brand vs Generic
- 5% brand / 95% generic
- Brand Drug Cost
- $23K
- Generic Drug Cost
- $31K
Patient Demographics
- Average Patient Age
- 60.9 years
- Avg HCC Risk Score
- 1.63
- Gender Split
- 48% female / 52% male
- Age Distribution
- <65: 16, 65-74: 11, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Gary Denny, D.O. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Buprenorphine-Nalo…
Buprenorphine-Naloxone
169 claims
- Buprenorphine Hcl 55
Buprenorphine Hcl
55 claims
- Gabapentin 27
Gabapentin
27 claims
- Zubsolv 24
Zubsolv
24 claims
- Hydroxyzine Hcl 18
Hydroxyzine Hcl
18 claims
- Bupropion Xl 17
Bupropion Xl
17 claims
- Citalopram Hbr 16
Citalopram Hbr
16 claims
- Mirtazapine 16
Mirtazapine
16 claims
| Drug | Claims |
|---|---|
| Buprenorphine-Naloxone Buprenorphine Hcl/Naloxone Hcl | 169 |
| Buprenorphine Hcl | 55 |
| Gabapentin | 27 |
| Zubsolv Buprenorphine Hcl/Naloxone Hcl | 24 |
| Hydroxyzine Hcl | 18 |
| Bupropion Xl Bupropion Hcl | 17 |
| Citalopram Hbr Citalopram Hydrobromide | 16 |
| Mirtazapine | 16 |
| Propranolol Hcl | 16 |
| Quetiapine Fumarate | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Addiction Medicine (Internal Medicine) Physician in OK →
All providers in Oklahoma →
Compare specialties →
Addiction Medicine (Internal Medicine) Physician Overview
How Gary Denny, D.O. 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
Gary Denny, D.O.'s 458 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 Denny, both outside Oklahoma so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (86.9 here).
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Addiction Medicine (Internal Medicine) Physician Providers in Oklahoma
Other clinicians with the same primary specialty enrolled in Oklahoma, drawn from the same CMS NPPES roster as Denny.
One of 3 Addiction Medicine (Internal Medicine) Physician providers enrolled in Oklahoma, 2 are shown here.
Frequently Asked Questions
What is Gary Denny, D.O.'s specialty? ▼
Gary Denny, D.O. specializes in Addiction Medicine (Internal Medicine) Physician and practices in Tulsa, Oklahoma. Credentials: D.O..
How much does Gary Denny, D.O. prescribe under Medicare Part D? ▼
In 2023, Gary Denny, D.O. wrote 458 Medicare Part D claims totaling $53K in drug costs for 29 beneficiaries.
What is Gary Denny, D.O.'s Medicare quality score? ▼
Gary Denny, D.O. has a CMS MIPS Final Score of 86.9/100 (Quality: 70.7, Cost: 59.6). 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 Gary Denny, D.O. located? ▼
Gary Denny, D.O. is located at 5310 E 31ST ST FL 11 STE 1102, Tulsa, OK, 74135. Phone: (918) 561-1700.
What is Gary Denny, D.O.'s NPI number? ▼
Gary Denny, D.O.'s National Provider Identifier (NPI) is 1558393637, issued on 07/07/2006.
Does Gary Denny, D.O. prescribe more brand-name or generic drugs? ▼
Gary Denny, D.O.'s prescribing is 5% brand-name and 95% generic drugs by claim count, with $23K in brand drug costs.
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.
What drugs does Gary Denny, D.O. prescribe most often? ▼
Based on 2023 Medicare Part D data, Gary Denny, D.O.'s most frequently prescribed drugs include Buprenorphine-Naloxone, Buprenorphine Hcl, Gabapentin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gary Denny, D.O. accept Medicare? ▼
Gary Denny, D.O. appears in CMS Medicare data with 458 Part D claims and 29 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gary Denny, D.O.'s credentials? ▼
Gary Denny, D.O.'s NPI is 1558393637 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 (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
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.