NPI registry status
Active
2026 NPPES data Geriatric Medicine (Internal Medicine) Physician NPI 1902866965 MD
Verify on CMS → Allen Jackson, MD
Geriatric Medicine (Internal Medicine) Physician in North Charleston, South Carolina.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 4,161 in Geriatric 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
802
Medicare Part D claims · 158 beneficiaries · Geriatric Medicine (Internal Medicine) Physician avg: 4K
Generic prescribing
92%
generic claims · 8% 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
Allen Jackson, MD filed 802 Medicare Part D claims in 2023 as a Geriatric Medicine (Internal Medicine) Physician in North Charleston, South Carolina, prescribing 92% generic.
- 802
- Part D claims, 2023
- 92%
- 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.
Allen Jackson, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
802 Top 27% higher than 73% 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-eligible specialty (heuristic, not verified)
Allen Jackson, 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 Allen Jackson, MD?
Quality data not reportedPrimary specialty
Geriatric Medicine (Internal Medicine) Physician
Medicare Part D claims
802 82% vs specialty avg
Specialty distribution in South Carolina
How Geriatric Medicine (Internal Medicine) Physician compares to other specialties among South Carolina 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 Geriatric 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).
Allen Jackson, MD appears in the CMS NPPES registry as a Geriatric Medicine (Internal Medicine) Physician provider holding MD credentials at 8761 DORCHESTER RD STE 100, North Charleston, SC, 29420, with a listed phone of (843) 767-3323. NPI 1902866965 was issued on 03/24/2006.
Medicare Part D records for calendar year 2023 show 802 prescription claims written by this provider, covering 158 Medicare beneficiaries and totaling roughly $67K in drug spend, split 8% brand-name and 92% generic by claim count, with an opioid prescribing rate of 2.0%.
Geriatric Medicine (Internal Medicine) Physician is a narrow specialty nationwide, with 4,161 enrolled providers across 52 states and an average of 4,450 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 | 1902866965 |
|---|---|
| Specialty | Geriatric Medicine (Internal Medicine) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 03/24/2006 |
Brand vs generic prescribing mix · Generic-heavy
Allen Jackson, MD - brand share 8.0%
Geriatric Medicine (Internal Medicine) Physician average
8% brand-name claims vs 92% generic, on 802 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.
802
Total Claims
$67K
Total Drug Cost
158
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,971
- Total Day Supply
- 58,536
- Brand vs Generic
- 8% brand / 92% generic
- Brand Drug Cost
- $46K
- Generic Drug Cost
- $21K
- Opioid Claims
- 16 (2.0% rate)
Patient Demographics
- Average Patient Age
- 74.5 years
- Avg HCC Risk Score
- 1.30
- Gender Split
- 60% female / 40% male
- Age Distribution
- <65: 21, 65-74: 59, 75-84: 50, 85+: 28
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Allen Jackson, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Amlodipine Besylate
Amlodipine Besylate
72 claims
- Atorvastatin Calcium
Atorvastatin Calcium
48 claims
- Lisinopril
Lisinopril
46 claims
- Hydrochlorothiazide
Hydrochlorothiazide
41 claims
- Levothyroxine Sodium 28
Levothyroxine Sodium
28 claims
- Simvastatin 27
Simvastatin
27 claims
- Metformin Hcl 22
Metformin Hcl
22 claims
- Buprenorphine-Nalo… 20
Buprenorphine-Naloxone
20 claims
| Drug | Claims |
|---|---|
| Amlodipine Besylate | 72 |
| Atorvastatin Calcium | 48 |
| Lisinopril | 46 |
| Hydrochlorothiazide | 41 |
| Levothyroxine Sodium | 28 |
| Simvastatin | 27 |
| Metformin Hcl | 22 |
| Buprenorphine-Naloxone Buprenorphine Hcl/Naloxone Hcl | 20 |
| Omeprazole | 16 |
| Losartan Potassium | 15 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Geriatric Medicine (Internal Medicine) Physician in SC →
All providers in South Carolina →
Compare specialties →
Geriatric Medicine (Internal Medicine) Physician Overview
How Allen Jackson, MD fits within the Geriatric Medicine (Internal Medicine) Physician landscape nationally.
4,161
Geriatric Medicine (Internal Medicine) Physician Providers in US
52
States with Geriatric Medicine (Internal Medicine) Physician
4,450
Avg Claims per Provider
Allen Jackson, MD's 802 claims are below the specialty average of 4,450.
Nearby Geriatric Medicine (Internal Medicine) Physician Providers in South Carolina
Other clinicians with the same primary specialty enrolled in South Carolina, drawn from the same CMS NPPES roster as Jackson.
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 South Carolina medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Geriatric 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.
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 South Carolina
Frequently Asked Questions
What is Allen Jackson, MD's specialty? ▼
Allen Jackson, MD specializes in Geriatric Medicine (Internal Medicine) Physician and practices in North Charleston, South Carolina. Credentials: MD.
How much does Allen Jackson, MD prescribe under Medicare Part D? ▼
In 2023, Allen Jackson, MD wrote 802 Medicare Part D claims totaling $67K in drug costs for 158 beneficiaries.
Where is Allen Jackson, MD located? ▼
Allen Jackson, MD is located at 8761 DORCHESTER RD STE 100, North Charleston, SC, 29420. Phone: (843) 767-3323.
What is Allen Jackson, MD's NPI number? ▼
Allen Jackson, MD's National Provider Identifier (NPI) is 1902866965, issued on 03/24/2006.
Does Allen Jackson, MD prescribe more brand-name or generic drugs? ▼
Allen Jackson, MD's prescribing is 8% brand-name and 92% generic drugs by claim count, with $46K in brand drug costs.
Does Allen Jackson, MD prescribe opioids? ▼
Yes, Allen Jackson, MD had 16 opioid claims in 2023 with an opioid prescribing rate of 2.0%.
How many Geriatric Medicine (Internal Medicine) Physician providers are there in the US? ▼
There are 4,161 Geriatric Medicine (Internal Medicine) Physician providers across 52 states in the US. The average Geriatric Medicine (Internal Medicine) Physician provider writes 4,450 Medicare Part D claims per year.
What drugs does Allen Jackson, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Allen Jackson, MD's most frequently prescribed drugs include Amlodipine Besylate, Atorvastatin Calcium, Lisinopril. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Allen Jackson, MD accept Medicare? ▼
Allen Jackson, MD appears in CMS Medicare data with 802 Part D claims and 158 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Allen Jackson, MD's credentials? ▼
Allen Jackson, MD's NPI is 1902866965 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.