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. 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
7K
Medicare Part D claims · 295 beneficiaries · Critical Care Medicine (Internal Medicine) Physician avg: 1K
Generic prescribing
91%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs

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 91% generic.

7K
Part D claims, 2023
91%
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

0–200: 670,926 prescribers (49%). Below this entry. 200–400: 182,923 prescribers (13%). Below this entry. 400–600: 90,619 prescribers (7%). Below this entry. 600–800: 56,224 prescribers (4%). Below this entry. 800–1,000: 40,919 prescribers (3%). Below this entry. 1,000–1,200: 31,827 prescribers (2%). Below this entry. 1,200–1,400: 26,224 prescribers (2%). Below this entry. 1,400–1,600: 21,710 prescribers (2%). Below this entry. 1,600–1,800: 19,072 prescribers (1%). Below this entry. 1,800–2,000: 16,451 prescribers (1%). Below this entry. 2,000–2,200: 213,991 prescribers (16%). This entry sits in this band. This provider 0 2K+ every Part D prescriber (claims/yr), bucketed by value

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-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 reported

NPI registry status

Active

Issued 06/23/2005

NPI 1821094830

Primary specialty

Critical Care Medicine (Internal Medicine) Physician

Mid-sized

6,631 US NPIs in this specialty

Medicare Part D claims

6,896 545% vs specialty avg

2023 prescription claims

Specialty avg: 1,069

Specialty distribution in Tennessee

How Critical Care Medicine (Internal Medicine) Physician compares to other specialties among Tennessee providers

Tennessee providers

Critical Care Medicine (Internal Medicine) Physician share within Tennessee

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

Specialty board-certification context

Estimated specialty board-certified rate — Critical Care Medicine (Internal Medicine) Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Critical Care Medicine (Internal Medicine) Physician ABMS/AOA estimate

Est. board-certified rate (Critical Care Medicine (Internal Medicine) Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Critical Care Medicine (Internal Medicine) Physician) — ABMS / AOA estimate

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. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what CHAMBERS 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 6,896 prescription claims written by this provider, covering 295 Medicare beneficiaries and totaling roughly $473K in drug spend, split 9% brand-name and 91% generic by claim count, with an opioid prescribing rate of 4.4%. 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.

Critical Care Medicine (Internal Medicine) Physician is a mid-sized specialty nationwide, with 6,631 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

56 E MAIN ST
MUNFORD, TN 38058

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%
Specialty average (est.)

9% brand-name claims vs 91% 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 / 91% 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

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

Critical Care Medicine (Internal Medicine) Physician Overview

How GEORGE CHAMBERS, MD fits within the Critical Care Medicine (Internal Medicine) Physician landscape nationally.

6,631
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.

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

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 91% 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 6,631 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

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