NPI registry status
Active
2026 NPPES data Critical Care Medicine (Internal Medicine) Physician NPI 1821094830 MD
Verify on CMS → George Chambers, MD
Critical Care Medicine (Internal Medicine) Physician in Munford, 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 6,646 in Critical Care 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
7K
Medicare Part D claims · 295 beneficiaries · Critical Care Medicine (Internal Medicine) Physician avg: 1K
Generic prescribing
90%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs
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
George Chambers, MD filed 6,896 Medicare Part D claims in 2023 as a Critical Care Medicine (Internal Medicine) Physician in Munford, Tennessee, prescribing 90% generic.
- 7K
- Part D claims, 2023
- 90%
- generic prescribing
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.
George Chambers, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
6,896 Top 4% higher than 96% 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)
George Chambers, 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 George Chambers, MD?
Quality data not reportedPrimary specialty
Critical Care Medicine (Internal Medicine) Physician
Medicare Part D claims
6,896 6× vs specialty avg
Specialty distribution in Tennessee
How Critical Care 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 Critical Care 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).
George Chambers, MD appears in the CMS NPPES registry as a Critical Care Medicine (Internal Medicine) Physician provider holding MD credentials at 56 E MAIN ST, Munford, TN, 38058, with a listed phone of (901) 837-3735. NPI 1821094830 was issued on 06/23/2005.
Medicare Part D records for calendar year 2023 show 6,896 prescription claims written by this provider, covering 295 Medicare beneficiaries and totaling roughly $473K in drug spend, split 9% brand-name and 90% generic by claim count, with an opioid prescribing rate of 4.4%.
Critical Care Medicine (Internal Medicine) Physician is a mid-sized specialty nationwide, with 6,646 enrolled providers across 53 states and an average of 1,069 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 | 1821094830 |
|---|---|
| Specialty | Critical Care Medicine (Internal Medicine) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 06/23/2005 |
Brand vs generic prescribing mix · Generic-heavy
George Chambers, MD - brand share 9.0%
Critical Care Medicine (Internal Medicine) Physician average
9% brand-name claims vs 90% generic, on 6,896 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.
6,896
Total Claims
$473K
Total Drug Cost
295
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 14,061
- Total Day Supply
- 413,723
- Brand vs Generic
- 9% brand / 90% generic
- Brand Drug Cost
- $366K
- Generic Drug Cost
- $105K
- Opioid Claims
- 304 (4.4% rate)
- Antibiotic Claims
- 129
Patient Demographics
- Average Patient Age
- 72.7 years
- Avg HCC Risk Score
- 1.40
- Gender Split
- 56% female / 44% male
- Age Distribution
- <65: 45, 65-74: 130, 75-84: 84, 85+: 36
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What George Chambers, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
336 claims
- Amlodipine Besylate
Amlodipine Besylate
328 claims
- Omeprazole
Omeprazole
296 claims
- Metformin Hcl
Metformin Hcl
192 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
184 claims
- Lisinopril
Lisinopril
172 claims
- Losartan Potassium
Losartan Potassium
169 claims
- Fluticasone Propio…
Fluticasone Propionate
166 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 336 |
| Amlodipine Besylate | 328 |
| Omeprazole | 296 |
| Metformin Hcl | 192 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 184 |
| Lisinopril | 172 |
| Losartan Potassium | 169 |
| Fluticasone Propionate | 166 |
| Metoprolol Tartrate | 148 |
| Tamsulosin Hcl | 148 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Critical Care Medicine (Internal Medicine) Physician in TN →
All providers in Tennessee →
Compare specialties →
Critical Care Medicine (Internal Medicine) Physician Overview
How George Chambers, MD fits within the Critical Care Medicine (Internal Medicine) Physician landscape nationally.
6,646
Critical Care Medicine (Internal Medicine) Physician Providers in US
53
States with Critical Care Medicine (Internal Medicine) Physician
1,069
Avg Claims per Provider
George Chambers, MD's 6,896 claims are above the specialty average of 1,069.
Nearby Critical Care 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 Chambers.
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 Critical Care Medicine (Internal 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 George Chambers, MD's specialty? ▼
George Chambers, MD specializes in Critical Care Medicine (Internal Medicine) Physician and practices in Munford, Tennessee. Credentials: MD.
How much does George Chambers, MD prescribe under Medicare Part D? ▼
In 2023, George Chambers, MD wrote 6,896 Medicare Part D claims totaling $473K in drug costs for 295 beneficiaries.
Where is George Chambers, MD located? ▼
George Chambers, MD is located at 56 E MAIN ST, Munford, TN, 38058. Phone: (901) 837-3735.
What is George Chambers, MD's NPI number? ▼
George Chambers, MD's National Provider Identifier (NPI) is 1821094830, issued on 06/23/2005.
Does George Chambers, MD prescribe more brand-name or generic drugs? ▼
George Chambers, MD's prescribing is 9% brand-name and 90% generic drugs by claim count, with $366K in brand drug costs.
Does George Chambers, MD prescribe opioids? ▼
Yes, George Chambers, MD had 304 opioid claims in 2023 with an opioid prescribing rate of 4.4%.
How many Critical Care Medicine (Internal Medicine) Physician providers are there in the US? ▼
There are 6,646 Critical Care Medicine (Internal Medicine) Physician providers across 53 states in the US. The average Critical Care Medicine (Internal Medicine) Physician provider writes 1,069 Medicare Part D claims per year.
What drugs does George Chambers, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, George Chambers, MD's most frequently prescribed drugs include Atorvastatin Calcium, Amlodipine Besylate, Omeprazole. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does George Chambers, MD accept Medicare? ▼
George Chambers, MD appears in CMS Medicare data with 6,896 Part D claims and 295 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify George Chambers, MD's credentials? ▼
George Chambers, MD's NPI is 1821094830 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.
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.