NPI registry status
Active
2026 NPPES data Addiction Medicine (Internal Medicine) Physician NPI 1124007984 MD
Verify on CMS → Marshall Johnson, MD
Addiction Medicine (Internal Medicine) Physician in Hendersonville, 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 571 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
573
Medicare Part D claims · 314 beneficiaries · Addiction Medicine (Internal Medicine) Physician avg: 1K
Generic prescribing
94%
generic claims · 6% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Marshall Johnson, MD filed 573 Medicare Part D claims in 2024 as an Addiction Medicine (Internal Medicine) Physician in Hendersonville, Tennessee, prescribing 94% generic.
- 573
- Part D claims, 2024
- 94%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥65th
- 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 Marshall Johnson, MD
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 1124007984), first enumerated 01/11/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 573 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
3 CMS Care Compare hospital affiliations on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- 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 1124007984 · Addiction Medicine (Internal Medicine) Physician
NPI-10 · ENUM-LEGACY · TAX-NARROW · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1124007984
- ENUM-LEGACY 2006
- TAX-NARROW 571
- RX-LIGHT 573
- BOOK-THIN 15 in Tennessee
- PHOTO-ENUM Felicitas Amador, M.D. · 2006
Marshall Johnson, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
573 ≥ 65th percentile 65% 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)
Marshall Johnson, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 3 hospital affiliations - 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 Marshall Johnson, MD?
Quality data not reportedPrimary specialty
Addiction Medicine (Internal Medicine) Physician
Medicare Part D claims
573 61% vs specialty avg
Specialty distribution in Tennessee
How Addiction Medicine (Internal 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 (Internal 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 | 1124007984 |
|---|---|
| Specialty | Addiction Medicine (Internal Medicine) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 01/11/2006 |
Hospital and facility affiliations
Facilities where Marshall Johnson, MD 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.
According to CMS billing records, Marshall Johnson, MD is affiliated with 3 Medicare-billing facilities.
Advanced Diagnostic Imaging PC
Gallatin, TN
Hospital Medicine Services OF TN LLC
Nashville, TN
Spero Health OF Tennessee, LLC
Dickson, TN
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
Marshall Johnson, MD - brand share 6.0%
Addiction Medicine (Internal Medicine) Physician average
6% brand-name claims vs 94% generic, on 573 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.
573
Total Claims
$28K
Total Drug Cost
314
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 580
- Total Day Supply
- 9,862
- Brand vs Generic
- 6% brand / 94% generic
- Brand Drug Cost
- $13K
- Generic Drug Cost
- $15K
- Opioid Claims
- 33 (5.8% rate)
- Antibiotic Claims
- 141
Patient Demographics
- Average Patient Age
- 69.1 years
- Avg HCC Risk Score
- 2.07
- Gender Split
- 56% female / 44% male
- Age Distribution
- <65: 90, 65-74: 117, 75-84: 75, 85+: 32
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Marshall Johnson, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Buprenorphine-Nalo…
Buprenorphine-Naloxone
128 claims
- Cefdinir
Cefdinir
52 claims
- Prednisone 27
Prednisone
27 claims
- Cefuroxime 19
Cefuroxime
19 claims
- Pantoprazole Sodium 19
Pantoprazole Sodium
19 claims
- Atorvastatin Calcium 17
Atorvastatin Calcium
17 claims
- Metoprolol Tartrate 17
Metoprolol Tartrate
17 claims
- Eliquis 15
Eliquis
15 claims
| Drug | Claims |
|---|---|
| Buprenorphine-Naloxone Buprenorphine Hcl/Naloxone Hcl | 128 |
| Cefdinir | 52 |
| Prednisone | 27 |
| Cefuroxime Cefuroxime Axetil | 19 |
| Pantoprazole Sodium | 19 |
| Atorvastatin Calcium | 17 |
| Metoprolol Tartrate | 17 |
| Eliquis Apixaban | 15 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 15 |
| Amlodipine Besylate | 12 |
* 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 TN →
All providers in Tennessee →
Compare specialties →
Addiction Medicine (Internal Medicine) Physician Overview
How Marshall Johnson, MD fits within the Addiction Medicine (Internal Medicine) Physician landscape nationally.
571
Addiction Medicine (Internal Medicine) Physician Providers in US
46
States with Addiction Medicine (Internal Medicine) Physician
1,455
Avg Claims per Provider
Marshall Johnson, MD's 573 claims are below the specialty average of 1,455.
Nationwide Addiction Medicine (Internal Medicine) Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Johnson, both outside Tennessee 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 Addiction Medicine (Internal Medicine) Physician Providers in Tennessee
Other clinicians with the same primary specialty enrolled in Tennessee, drawn from the same CMS NPPES roster as Johnson.
One of 15 Addiction Medicine (Internal Medicine) Physician providers enrolled in Tennessee, 5 are shown here.
Frequently Asked Questions
What is Marshall Johnson, MD's specialty? ▼
Marshall Johnson, MD specializes in Addiction Medicine (Internal Medicine) Physician and practices in Hendersonville, Tennessee. Credentials: MD.
How much does Marshall Johnson, MD prescribe under Medicare Part D? ▼
In 2024, Marshall Johnson, MD wrote 573 Medicare Part D claims totaling $28K in drug costs for 314 beneficiaries.
Where is Marshall Johnson, MD located? ▼
Marshall Johnson, MD is located at 355 NEW SHACKLE ISLAND RD, Hendersonville, TN, 37075. Phone: (615) 338-1000.
What is Marshall Johnson, MD's NPI number? ▼
Marshall Johnson, MD's National Provider Identifier (NPI) is 1124007984, issued on 01/11/2006.
Does Marshall Johnson, MD prescribe more brand-name or generic drugs? ▼
Marshall Johnson, MD's prescribing is 6% brand-name and 94% generic drugs by claim count, with $13K in brand drug costs.
Does Marshall Johnson, MD prescribe opioids? ▼
Yes, Marshall Johnson, MD had 33 opioid claims in 2024 with an opioid prescribing rate of 5.8%.
How many Addiction Medicine (Internal Medicine) Physician providers are there in the US? ▼
There are 571 Addiction Medicine (Internal Medicine) Physician providers across 46 states in the US. The average Addiction Medicine (Internal Medicine) Physician provider writes 1,455 Medicare Part D claims per year.
What drugs does Marshall Johnson, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Marshall Johnson, MD's most frequently prescribed drugs include Buprenorphine-Naloxone, Cefdinir, Prednisone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Marshall Johnson, MD accept Medicare? ▼
Marshall Johnson, MD appears in CMS Medicare data with 573 Part D claims and 314 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Marshall Johnson, MD's credentials? ▼
Marshall Johnson, MD's NPI is 1124007984 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 (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.