NPI registry status
Active
2026 NPPES data Specialist NPI 1366520298 M.D.
Verify on CMS → Eric Chatman, M.D.
Specialist in Opelousas, Louisiana.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 69,608 in Specialist, 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
6K
Medicare Part D claims · 182 beneficiaries · Specialist avg: 1K
Generic prescribing
86%
generic claims · 13% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$238.94
11 payments · CMS Open Payments (Sunshine Act)
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
Eric Chatman, M.D. filed 6,130 Medicare Part D claims in 2023 as a Specialist in Opelousas, Louisiana, prescribing 86% generic.
- 6K
- Part D claims, 2023
- 86%
- generic prescribing
- $238.94
- industry payments (Sunshine Act)
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.
Eric Chatman, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
6,130 Top 5% higher than 95% 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
What does the federal data show about Eric Chatman, M.D.?
Quality data not reportedPrimary specialty
Specialist
Medicare Part D claims
6,130 316% vs specialty avg
Specialty distribution in Louisiana
How Specialist compares to other specialties among Louisiana 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 Specialist. 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).
Eric Chatman, M.D. appears in the CMS NPPES registry as a Specialist provider holding M.D. credentials at 2362 LARKSPUR LN, Opelousas, LA, 70570, with a listed phone of (337) 948-8269. NPI 1366520298 was issued on 11/01/2006.
Medicare Part D records for calendar year 2023 show 6,130 prescription claims written by this provider, covering 182 Medicare beneficiaries and totaling roughly $719K in drug spend, split 13% brand-name and 86% generic by claim count, with an opioid prescribing rate of 6.0%.
Specialist is a high-volume specialty nationwide, with 69,608 enrolled providers across 55 states and an average of 1,474 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 | 1366520298 |
|---|---|
| Specialty | Specialist |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 11/01/2006 |
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 Eric Chatman, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$239
Largest payer
AstraZeneca Pharmaceuticals LP
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.
Brand vs generic prescribing mix · Typical
Eric Chatman, M.D. - brand share 13.0%
Specialist average
13% brand-name claims vs 86% generic, on 6,130 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.
6,130
Total Claims
$719K
Total Drug Cost
182
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 8,889
- Total Day Supply
- 258,935
- Brand vs Generic
- 13% brand / 86% generic
- Brand Drug Cost
- $610K
- Generic Drug Cost
- $108K
- Opioid Claims
- 365 (6.0% rate)
- Antibiotic Claims
- 85
Patient Demographics
- Average Patient Age
- 72.9 years
- Avg HCC Risk Score
- 1.36
- Gender Split
- 49% female / 51% male
- Age Distribution
- <65: 24, 65-74: 74, 75-84: 63, 85+: 21
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Eric Chatman, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Rosuvastatin Calcium
Rosuvastatin Calcium
507 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
246 claims
- Amlodipine Besylate 200
Amlodipine Besylate
200 claims
- Levothyroxine Sodium 176
Levothyroxine Sodium
176 claims
- Olmesartan Medoxomil 171
Olmesartan Medoxomil
171 claims
- Famotidine 165
Famotidine
165 claims
- Levocetirizine Dih… 155
Levocetirizine Dihydrochloride
155 claims
- Montelukast Sodium 152
Montelukast Sodium
152 claims
| Drug | Claims |
|---|---|
| Rosuvastatin Calcium | 507 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 246 |
| Amlodipine Besylate | 200 |
| Levothyroxine Sodium | 176 |
| Olmesartan Medoxomil | 171 |
| Famotidine | 165 |
| Levocetirizine Dihydrochloride | 155 |
| Montelukast Sodium | 152 |
| Pravastatin Sodium | 143 |
| Olmesartan-Hydrochlorothiazide Olmesartan/Hydrochlorothiazide | 139 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Specialist Overview
How Eric Chatman, M.D. fits within the Specialist landscape nationally.
69,608
Specialist Providers in US
55
States with Specialist
1,474
Avg Claims per Provider
Eric Chatman, M.D.'s 6,130 claims are above the specialty average of 1,474.
Nearby Specialist Providers in Louisiana
Other clinicians with the same primary specialty enrolled in Louisiana, drawn from the same CMS NPPES roster as Chatman.
Dr. Fadi Abou-Issa
MD
Houma, LA
Dr. Tamer Acikalin
M.D.
Marrero, LA
Dr. Elsie Adams
MSW
New Orleans, LA
Dr. Deborah Adcock
M.D.
Shreveport, LA
Dr. Iqbal Ahmad
M.D.
Baton Rouge, LA
Compare Specialist 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 Louisiana medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Specialist 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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Medical Specialties Explained
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Understanding Medicare Claims Data
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Frequently Asked Questions
What is Eric Chatman, M.D.'s specialty? ▼
Eric Chatman, M.D. specializes in Specialist and practices in Opelousas, Louisiana. Credentials: M.D..
How much does Eric Chatman, M.D. prescribe under Medicare Part D? ▼
In 2023, Eric Chatman, M.D. wrote 6,130 Medicare Part D claims totaling $719K in drug costs for 182 beneficiaries.
Where is Eric Chatman, M.D. located? ▼
Eric Chatman, M.D. is located at 2362 LARKSPUR LN, Opelousas, LA, 70570. Phone: (337) 948-8269.
What is Eric Chatman, M.D.'s NPI number? ▼
Eric Chatman, M.D.'s National Provider Identifier (NPI) is 1366520298, issued on 11/01/2006.
Does Eric Chatman, M.D. prescribe more brand-name or generic drugs? ▼
Eric Chatman, M.D.'s prescribing is 13% brand-name and 86% generic drugs by claim count, with $610K in brand drug costs.
Does Eric Chatman, M.D. prescribe opioids? ▼
Yes, Eric Chatman, M.D. had 365 opioid claims in 2023 with an opioid prescribing rate of 6.0%.
How many Specialist providers are there in the US? ▼
There are 69,608 Specialist providers across 55 states in the US. The average Specialist provider writes 1,474 Medicare Part D claims per year.
What drugs does Eric Chatman, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Eric Chatman, M.D.'s most frequently prescribed drugs include Rosuvastatin Calcium, Hydrocodone-Acetaminophen, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Eric Chatman, M.D. accept Medicare? ▼
Eric Chatman, M.D. appears in CMS Medicare data with 6,130 Part D claims and 182 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Eric Chatman, M.D.'s credentials? ▼
Eric Chatman, M.D.'s NPI is 1366520298 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.
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.