NPI registry status
Active
2026 NPPES data Addiction Medicine (Family Medicine) Physician NPI 1922136449 MD
Verify on CMS → Winston Griner, MD
Addiction Medicine (Family Medicine) Physician in Nashville, Tennessee.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 763 in Addiction Medicine (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
235
Medicare Part D claims · 27 beneficiaries · Addiction Medicine (Family Medicine) Physician avg: 1K
Generic prescribing
89%
generic claims · 11% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$1.2K
13 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
Winston Griner, MD filed 235 Medicare Part D claims in 2023 as a Addiction Medicine (Family Medicine) Physician in Nashville, Tennessee, prescribing 89% generic.
- 235
- Part D claims, 2023
- 89%
- generic prescribing
- $1.2K
- industry payments (Sunshine Act)
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.
Winston Griner, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
235 49th percentile higher than 49% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
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Board-eligible specialty (heuristic, not verified)
Winston Griner, MD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Winston Griner, MD?
Quality data not reportedPrimary specialty
Addiction Medicine (Family Medicine) Physician
Medicare Part D claims
235 79% vs specialty avg
Specialty distribution in Tennessee
How Addiction Medicine (Family Medicine) Physician compares to other specialties among Tennessee 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 Addiction Medicine (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).
Winston Griner, MD appears in the CMS NPPES registry as a Addiction Medicine (Family Medicine) Physician provider holding MD credentials at 5722 HICKORY PLZ STE B4, Nashville, TN, 37211, with a listed phone of (615) 429-6420. NPI 1922136449 was issued on 02/28/2007.
Medicare Part D records for calendar year 2023 show 235 prescription claims written by this provider, covering 27 Medicare beneficiaries and totaling roughly $31K in drug spend, split 11% brand-name and 89% generic by claim count.
Addiction Medicine (Family Medicine) Physician is a narrow specialty nationwide, with 763 enrolled providers across 48 states and an average of 1,134 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 | 1922136449 |
|---|---|
| Specialty | Addiction Medicine (Family Medicine) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 02/28/2007 |
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 Winston Griner, MD. Source: openpaymentsdata.cms.gov.
Total received
$1.2K
Largest payer
ITI, Inc. (d/b/a Intra-Cellular Therapies, 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
Winston Griner, MD - brand share 11.0%
Addiction Medicine (Family Medicine) Physician average
11% brand-name claims vs 89% generic, on 235 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.
235
Total Claims
$31K
Total Drug Cost
27
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 297
- Total Day Supply
- 8,149
- Brand vs Generic
- 11% brand / 89% generic
- Brand Drug Cost
- $14K
- Generic Drug Cost
- $18K
Patient Demographics
- Average Patient Age
- 65.6 years
- Avg HCC Risk Score
- 1.13
- Gender Split
- 48% female / 52% male
- Age Distribution
- <65: 12, 65-74: N/A, 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.
| Drug | Claims |
|---|---|
| Buprenorphine-Naloxone Buprenorphine Hcl/Naloxone Hcl | 130 |
| Suboxone Buprenorphine Hcl/Naloxone Hcl | 14 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Addiction Medicine (Family Medicine) Physician in TN →
All providers in Tennessee →
Compare specialties →
Addiction Medicine (Family Medicine) Physician Overview
How Winston Griner, MD fits within the Addiction Medicine (Family Medicine) Physician landscape nationally.
763
Addiction Medicine (Family Medicine) Physician Providers in US
48
States with Addiction Medicine (Family Medicine) Physician
1,134
Avg Claims per Provider
Winston Griner, MD's 235 claims are below the specialty average of 1,134.
Nearby Addiction Medicine (Family Medicine) Physician Providers in Tennessee
Other clinicians with the same primary specialty enrolled in Tennessee, drawn from the same CMS NPPES roster as Griner.
Dr. Terrence Alley
MD
Nashville, TN
Dr. James Appleton
MD
Jackson, TN
Dr. Drew Blackstock
MD
Bartlett, TN
Dr. Nicholas Conley
MD
Franklin, TN
Dr. Charles Cox
M.D.
Athens, TN
Compare Addiction Medicine (Family Medicine) 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 Tennessee medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Addiction Medicine (Family Medicine) 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 Winston Griner, MD's specialty? ▼
Winston Griner, MD specializes in Addiction Medicine (Family Medicine) Physician and practices in Nashville, Tennessee. Credentials: MD.
How much does Winston Griner, MD prescribe under Medicare Part D? ▼
In 2023, Winston Griner, MD wrote 235 Medicare Part D claims totaling $31K in drug costs for 27 beneficiaries.
Where is Winston Griner, MD located? ▼
Winston Griner, MD is located at 5722 HICKORY PLZ STE B4, Nashville, TN, 37211. Phone: (615) 429-6420.
What is Winston Griner, MD's NPI number? ▼
Winston Griner, MD's National Provider Identifier (NPI) is 1922136449, issued on 02/28/2007.
Does Winston Griner, MD prescribe more brand-name or generic drugs? ▼
Winston Griner, MD's prescribing is 11% brand-name and 89% generic drugs by claim count, with $14K in brand drug costs.
How many Addiction Medicine (Family Medicine) Physician providers are there in the US? ▼
There are 763 Addiction Medicine (Family Medicine) Physician providers across 48 states in the US. The average Addiction Medicine (Family Medicine) Physician provider writes 1,134 Medicare Part D claims per year.
What drugs does Winston Griner, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Winston Griner, MD's most frequently prescribed drugs include Buprenorphine-Naloxone, Suboxone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Winston Griner, MD accept Medicare? ▼
Winston Griner, MD appears in CMS Medicare data with 235 Part D claims and 27 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Winston Griner, MD's credentials? ▼
Winston Griner, MD's NPI is 1922136449 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.
- 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.