NPI registry status
Active
2026 NPPES data Gastroenterology Physician NPI 1609848738 M.D.
Verify on CMS → William Alexander, M.D.
Gastroenterology 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 16,567 in Gastroenterology 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
2K
Medicare Part D claims · 231 beneficiaries · Gastroenterology Physician avg: 833
Industry payments
$346.53
11 payments · CMS Open Payments (Sunshine Act)
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
William Alexander, M.D. filed 1,815 Medicare Part D claims in 2023 as a Gastroenterology Physician in Nashville, Tennessee.
- 2K
- Part D claims, 2023
- 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.
William Alexander, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,815 Top 17% higher than 83% 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
✓
Board certification likely (heuristic, not verified)
William Alexander, M.D. 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 William Alexander, M.D.?
Quality data not reportedPrimary specialty
Gastroenterology Physician
Medicare Part D claims
1,815 118% vs specialty avg
Specialty distribution in Tennessee
How Gastroenterology 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 Gastroenterology 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).
William Alexander, M.D. appears in the CMS NPPES registry as a Gastroenterology Physician provider holding M.D. credentials at 343 22ND AVE N, Nashville, TN, 37203, with a listed phone of (615) 327-7835. NPI 1609848738 was issued on 02/02/2006.
Medicare Part D records for calendar year 2023 show 1,815 prescription claims written by this provider, covering 231 Medicare beneficiaries and totaling roughly $453K in drug spend, with an opioid prescribing rate of 1.5%.
Gastroenterology Physician is a mid-sized specialty nationwide, with 16,567 enrolled providers across 54 states and an average of 833 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 | 1609848738 |
|---|---|
| Specialty | Gastroenterology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 02/02/2006 |
Hospital and facility affiliations
Facilities where William Alexander, 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.
According to CMS billing records, William Alexander, M.D. is affiliated with 3 Medicare-billing facilities.
Advanced Diagnostic Imaging PC
McMinnville, TN
Saint Thomas Medical Partners
Murfreesboro, TN
UT Regional One Physicians Inc
Memphis, 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).
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 William Alexander, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$347
Largest payer
EVOKE PHARMA, 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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
1,815
Total Claims
$453K
Total Drug Cost
231
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 2,702
- Total Day Supply
- 78,430
- Generic Drug Cost
- $59K
- Opioid Claims
- 27 (1.5% rate)
- Antibiotic Claims
- 45
Patient Demographics
- Average Patient Age
- 69.3 years
- Avg HCC Risk Score
- 1.46
- Gender Split
- 64% female / 36% male
- Age Distribution
- <65: 55, 65-74: 114, 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 William Alexander, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Metoclopramide Hcl
Metoclopramide Hcl
302 claims
- Pantoprazole Sodium
Pantoprazole Sodium
226 claims
- Famotidine
Famotidine
158 claims
- Dicyclomine Hcl 102
Dicyclomine Hcl
102 claims
- Linzess 74
Linzess
74 claims
- Alprazolam 61
Alprazolam
61 claims
- Sucralfate 56
Sucralfate
56 claims
- Omeprazole 54
Omeprazole
54 claims
| Drug | Claims |
|---|---|
| Metoclopramide Hcl | 302 |
| Pantoprazole Sodium | 226 |
| Famotidine | 158 |
| Dicyclomine Hcl | 102 |
| Linzess Linaclotide | 74 |
| Alprazolam | 61 |
| Sucralfate | 56 |
| Omeprazole | 54 |
| Promethazine Hcl | 52 |
| Bethanechol Chloride | 45 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gastroenterology Physician Overview
How William Alexander, M.D. fits within the Gastroenterology Physician landscape nationally.
16,567
Gastroenterology Physician Providers in US
54
States with Gastroenterology Physician
833
Avg Claims per Provider
William Alexander, M.D.'s 1,815 claims are above the specialty average of 833.
Nearby Gastroenterology Physician Providers in Tennessee
Other clinicians with the same primary specialty enrolled in Tennessee, drawn from the same CMS NPPES roster as Alexander.
Dr. Ahmad Abu-Heija
M.D.
Oak Ridge, TN
Dr. Linas Adams
MD
Morristown, TN
Dr. Uchenna Agbim
MD
Memphis, TN
Dr. Nazneen Ahmed
M.D.
Memphis, TN
Dr. Abdullah Al-Rashdan
M.D.
Memphis, TN
Compare Gastroenterology 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 Gastroenterology 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.
Healthcare Guides
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Tennessee
Frequently Asked Questions
What is William Alexander, M.D.'s specialty? ▼
William Alexander, M.D. specializes in Gastroenterology Physician and practices in Nashville, Tennessee. Credentials: M.D..
How much does William Alexander, M.D. prescribe under Medicare Part D? ▼
In 2023, William Alexander, M.D. wrote 1,815 Medicare Part D claims totaling $453K in drug costs for 231 beneficiaries.
Where is William Alexander, M.D. located? ▼
William Alexander, M.D. is located at 343 22ND AVE N, Nashville, TN, 37203. Phone: (615) 327-7835.
What is William Alexander, M.D.'s NPI number? ▼
William Alexander, M.D.'s National Provider Identifier (NPI) is 1609848738, issued on 02/02/2006.
Does William Alexander, M.D. prescribe opioids? ▼
Yes, William Alexander, M.D. had 27 opioid claims in 2023 with an opioid prescribing rate of 1.5%.
How many Gastroenterology Physician providers are there in the US? ▼
There are 16,567 Gastroenterology Physician providers across 54 states in the US. The average Gastroenterology Physician provider writes 833 Medicare Part D claims per year.
What drugs does William Alexander, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, William Alexander, M.D.'s most frequently prescribed drugs include Metoclopramide Hcl, Pantoprazole Sodium, Famotidine. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does William Alexander, M.D. accept Medicare? ▼
William Alexander, M.D. appears in CMS Medicare data with 1,815 Part D claims and 231 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Alexander, M.D.'s credentials? ▼
William Alexander, M.D.'s NPI is 1609848738 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.
- 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.