2026 NPPES data Addiction Medicine (Internal Medicine) Physician NPI 1558393637 D.O.
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GARY DENNY, D.O.

Addiction Medicine (Internal Medicine) Physician in TULSA, Oklahoma. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
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
86.8556/100
▲ 4 pts above national avg 83.1 · [object Object]

What the federal data shows

GARY DENNY, D.O. reported a CMS MIPS final score of 86.8556/100 — above the 83.1 national average — and filed 458 Medicare Part D claims in 2023.

86.8556/100
MIPS score · +4 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.

GARY DENNY, D.O.'s MIPS score vs every scored U.S. clinician

CMS Merit-based Incentive Payment System (MIPS) final score, 2023 — the federal quality measure

87 Top 48% higher than 52% of 477,587 scored providers

0–10: 8,684 scored providers (2%). Below this entry. 10–20: 3,008 scored providers (1%). Below this entry. 20–30: 3,069 scored providers (1%). Below this entry. 30–40: 2,746 scored providers (1%). Below this entry. 40–50: 2,928 scored providers (1%). Below this entry. 50–60: 5,882 scored providers (1%). Below this entry. 60–70: 13,906 scored providers (3%). Below this entry. 70–80: 118,074 scored providers (25%). Below this entry. 80–90: 129,887 scored providers (27%). This entry sits in this band. 90–100: 189,403 scored providers (40%). Above this entry. This provider 0 100 every MIPS-scored clinician, bucketed by value

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

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)

NPI registry status

Active

Issued 07/07/2006

NPI 1558393637

Primary specialty

Addiction Medicine (Internal Medicine) Physician

Niche

553 US NPIs in this specialty

Medicare Part D claims

458 67% vs specialty avg

2023 prescription claims

Specialty avg: 1,403

MIPS final score

86.8556/100 3.755600000000001% pts

Above neutral band

vs 83.1 national avg

Specialty distribution in Oklahoma

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

Oklahoma providers

Addiction Medicine (Internal Medicine) Physician share within Oklahoma

1. Addiction Medicine (Internal Medicine) Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Addiction Medicine (Internal Medicine) Physician share within Oklahoma

Medicare quality performance — MIPS

GARY DENNY, D.O.'s 2023 MIPS final score plotted against the Addiction Medicine (Internal Medicine) Physician national average

High performer (top quartile)
MIPS Final Score
86.8556/100
vs 83.1 national avg · 2023 performance year

MIPS final score (Addiction Medicine (Internal Medicine) Physician) — 86.8556/100 vs national avg 83.1

0%100%National avg83%86.9%
MIPS final score (Addiction Medicine (Internal Medicine) Physician) — 86.8556/100 vs national avg 83.1

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).

GARY DENNY, D.O. appears in the CMS NPPES registry as a Addiction Medicine (Internal Medicine) Physician provider holding D.O. credentials at 5310 E 31ST ST FL 11 STE 1102, TULSA, OK, 74135, with a listed phone of (918) 561-1700. NPI 1558393637 was issued on 07/07/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what DENNY most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 458 prescription claims written by this provider, covering 29 Medicare beneficiaries and totaling roughly $53K in drug spend, split 5% brand-name and 95% generic by claim count. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 86.8556/100 for the 2023 performance year (Quality 70.6959, Cost 59.5905), compared with the national average of 83.1.

Addiction Medicine (Internal Medicine) Physician is a narrow specialty nationwide, with 553 enrolled providers across 46 states and an average of 1,403 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

5310 E 31ST ST FL 11 STE 1102
TULSA, OK 74135

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
Avg: 83.1
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%
Specialty average (est.)

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

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2023
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.

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.

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.

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

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 86.8556/100 (Quality: 70.6959, Cost: 59.5905). The national average MIPS Final Score is 83.1. 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

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