2026 NPPES data Clinical Pathology/Laboratory Medicine Physician NPI 1902864846 MD
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ALEXANDER DUNCAN, MD

Clinical Pathology/Laboratory Medicine Physician in ATLANTA, Georgia. 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
22
Medicare Part D claims · Clinical Pathology/Laboratory Medicine Physician avg: 149
Generic prescribing
0%
generic claims · 100% brand-name · higher generic rates reduce patient out-of-pocket costs

What the federal data shows

ALEXANDER DUNCAN, MD filed 22 Medicare Part D claims in 2023 as a Clinical Pathology/Laboratory Medicine Physician in ATLANTA, Georgia, prescribing 0% generic.

22
Part D claims, 2023
0%
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.

ALEXANDER DUNCAN, MD's Medicare Part D volume vs every U.S. prescriber

Total Medicare Part D claims, 2023 — across all CMS prescribers nationally

22 0th percentile higher than 0% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). This entry sits in this band. 200–400: 182,923 prescribers (13%). Above this entry. 400–600: 90,619 prescribers (7%). Above this entry. 600–800: 56,224 prescribers (4%). Above this entry. 800–1,000: 40,919 prescribers (3%). Above this entry. 1,000–1,200: 31,827 prescribers (2%). Above this entry. 1,200–1,400: 26,224 prescribers (2%). Above this entry. 1,400–1,600: 21,710 prescribers (2%). Above this entry. 1,600–1,800: 19,072 prescribers (1%). Above this entry. 1,800–2,000: 16,451 prescribers (1%). Above this entry. 2,000–2,200: 213,991 prescribers (16%). Above this entry. 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)

ALEXANDER DUNCAN, 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 ALEXANDER DUNCAN, MD?

Quality data not reported

NPI registry status

Active

Issued 05/02/2006

NPI 1902864846

Primary specialty

Clinical Pathology/Laboratory Medicine Physician

Niche

1,229 US NPIs in this specialty

Medicare Part D claims

22 85% vs specialty avg

2023 prescription claims

Specialty avg: 149

Specialty distribution in Georgia

How Clinical Pathology/Laboratory Medicine Physician compares to other specialties among Georgia providers

Georgia providers

Clinical Pathology/Laboratory Medicine Physician share within Georgia

1. Clinical Pathology/Laboratory Medicine Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Clinical Pathology/Laboratory Medicine Physician share within Georgia

Specialty board-certification context

Estimated specialty board-certified rate — Clinical Pathology/Laboratory Medicine Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Clinical Pathology/Laboratory Medicine Physician ABMS/AOA estimate

Est. board-certified rate (Clinical Pathology/Laboratory Medicine Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Clinical Pathology/Laboratory 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).

ALEXANDER DUNCAN, MD appears in the CMS NPPES registry as a Clinical Pathology/Laboratory Medicine Physician provider holding MD credentials at 1364 CLIFTON RD NE, ATLANTA, GA, 30322, with a listed phone of (404) 712-7294. NPI 1902864846 was issued on 05/02/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what DUNCAN 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 22 prescription claims written by this provider, covering N/A Medicare beneficiaries and totaling roughly $23K in drug spend, split 100% brand-name and 0% generic by claim count. 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.

Clinical Pathology/Laboratory Medicine Physician is a narrow specialty nationwide, with 1,229 enrolled providers across 51 states and an average of 149 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

1364 CLIFTON RD NE
ATLANTA, GA 30322

Provider Details

NPI 1902864846
Specialty Clinical Pathology/Laboratory Medicine Physician
Credentials MD
Gender Male
NPI Issued 05/02/2006

Brand vs generic prescribing mix · Brand-heavy

ALEXANDER DUNCAN, MD — brand share 100.0%
Specialty average (est.)

100% brand-name claims vs 0% generic, on 22 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.

22
Total Claims
$23K
Total Drug Cost
N/A
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
42
Total Day Supply
1,260
Brand vs Generic
100% brand / 0% generic
Brand Drug Cost
$23K
Generic Drug Cost
$0

Patient Demographics

Average Patient Age
63.6 years
Avg HCC Risk Score
1.12

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

Drug Claims
Xarelto
Rivaroxaban
11

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

Clinical Pathology/Laboratory Medicine Physician Overview

How ALEXANDER DUNCAN, MD fits within the Clinical Pathology/Laboratory Medicine Physician landscape nationally.

1,229
Clinical Pathology/Laboratory Medicine Physician Providers in US
51
States with Clinical Pathology/Laboratory Medicine Physician
149
Avg Claims per Provider

ALEXANDER DUNCAN, MD's 22 claims are below the specialty average of 149.

Nearby Clinical Pathology/Laboratory Medicine Physician Providers in Georgia

Other clinicians with the same primary specialty enrolled in Georgia, drawn from the same CMS NPPES roster as DUNCAN.

Compare Clinical Pathology/Laboratory Medicine Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is ALEXANDER DUNCAN, MD's specialty?
ALEXANDER DUNCAN, MD specializes in Clinical Pathology/Laboratory Medicine Physician and practices in ATLANTA, Georgia. Credentials: MD.
How much does ALEXANDER DUNCAN, MD prescribe under Medicare Part D?
In 2023, ALEXANDER DUNCAN, MD wrote 22 Medicare Part D claims totaling $23K in drug costs for N/A beneficiaries.
Where is ALEXANDER DUNCAN, MD located?
ALEXANDER DUNCAN, MD is located at 1364 CLIFTON RD NE, ATLANTA, GA, 30322. Phone: (404) 712-7294.
What is ALEXANDER DUNCAN, MD's NPI number?
ALEXANDER DUNCAN, MD's National Provider Identifier (NPI) is 1902864846, issued on 05/02/2006.
Does ALEXANDER DUNCAN, MD prescribe more brand-name or generic drugs?
ALEXANDER DUNCAN, MD's prescribing is 100% brand-name and 0% generic drugs by claim count, with $23K in brand drug costs.
How many Clinical Pathology/Laboratory Medicine Physician providers are there in the US?
There are 1,229 Clinical Pathology/Laboratory Medicine Physician providers across 51 states in the US. The average Clinical Pathology/Laboratory Medicine Physician provider writes 149 Medicare Part D claims per year.
What drugs does ALEXANDER DUNCAN, MD prescribe most often?
Based on 2023 Medicare Part D data, ALEXANDER DUNCAN, MD's most frequently prescribed drugs include Xarelto. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does ALEXANDER DUNCAN, MD accept Medicare?
ALEXANDER DUNCAN, MD appears in CMS Medicare data with 22 Part D claims and N/A Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify ALEXANDER DUNCAN, MD's credentials?
ALEXANDER DUNCAN, MD's NPI is 1902864846 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