NPI registry status
Active
2026 NPPES data Retina Specialist (Ophthalmology) Physician NPI 1588636484 M.D.
Verify on CMS → Eric Thomas, M.D.
Retina Specialist (Ophthalmology) Physician in Sioux Falls, South Dakota.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 983 in Retina Specialist (Ophthalmology) 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
532
Medicare Part D claims · 173 beneficiaries · Retina Specialist (Ophthalmology) Physician avg: 593
Generic prescribing
65%
generic claims · 35% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$401.28
11 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Eric Thomas, M.D. filed 532 Medicare Part D claims in 2024 as a Retina Specialist (Ophthalmology) Physician in Sioux Falls, South Dakota, prescribing 65% generic.
- 532
- Part D claims, 2024
- 65%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥65th
- pct by Part D claim volume (lower-bound band)
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.
Federal trust snapshot
What official records show about Eric Thomas, M.D.
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1588636484), first enumerated 02/03/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 532 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$401.28 in reported industry payments (11 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1588636484 · Retina Specialist (Ophthalmology) Physician
NPI-10 · ENUM-LEGACY · TAX-NARROW · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1588636484
- ENUM-LEGACY 2006
- TAX-NARROW 983
- RX-LIGHT 532
- BOOK-THIN 5 in South Dakota
- PHOTO-ENUM Scott Dorin · 2006
Eric Thomas, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
532 ≥ 65th percentile 65% of 1,416,883 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
✓
Board certification likely (heuristic, not verified)
Eric Thomas, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Eric Thomas, M.D.?
Quality data not reportedPrimary specialty
Retina Specialist (Ophthalmology) Physician
Medicare Part D claims
532 10% vs specialty avg
Specialty distribution in South Dakota
How Retina Specialist (Ophthalmology) Physician compares to other specialties among South Dakota 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 Retina Specialist (Ophthalmology) 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).
Practice Address
Provider Details
| NPI | 1588636484 |
|---|---|
| Specialty | Retina Specialist (Ophthalmology) Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 02/03/2006 |
Hospital and facility affiliations
Facilities where Eric Thomas, M.D. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Ophthalmology Ltd
Sioux Falls, SD
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
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 Thomas, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$401
Largest payer
Alimera Sciences, Inc.
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 · Above average
Eric Thomas, M.D. - brand share 35.0%
Retina Specialist (Ophthalmology) Physician average
35% brand-name claims vs 65% generic, on 532 2024 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 2024.
532
Total Claims
$16K
Total Drug Cost
173
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 724.667
- Total Day Supply
- 20,083
- Brand vs Generic
- 35% brand / 65% generic
- Brand Drug Cost
- $9K
- Generic Drug Cost
- $7K
Patient Demographics
- Average Patient Age
- 72.7 years
- Avg HCC Risk Score
- 1.46
- Gender Split
- 50% female / 50% male
- Age Distribution
- <65: 15, 65-74: 91, 75-84: 51, 85+: 16
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Eric Thomas, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Prednisolone Acetate
Prednisolone Acetate
176 claims
- Atropine Sulfate
Atropine Sulfate
160 claims
- Polymyxin B Sul-Tr…
Polymyxin B Sul-Trimethoprim
140 claims
- Ofloxacin 18
Ofloxacin
18 claims
| Drug | Claims |
|---|---|
| Prednisolone Acetate | 176 |
| Atropine Sulfate | 160 |
| Polymyxin B Sul-Trimethoprim Polymyxin B Sulf/Trimethoprim | 140 |
| Ofloxacin | 18 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Retina Specialist (Ophthalmology) Physician in SD →
All providers in South Dakota →
Compare specialties →
Retina Specialist (Ophthalmology) Physician Overview
How Eric Thomas, M.D. fits within the Retina Specialist (Ophthalmology) Physician landscape nationally.
983
Retina Specialist (Ophthalmology) Physician Providers in US
48
States with Retina Specialist (Ophthalmology) Physician
593
Avg Claims per Provider
Eric Thomas, M.D.'s 532 claims are below the specialty average of 593.
Nationwide Retina Specialist (Ophthalmology) Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Thomas, both outside South Dakota so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Retina Specialist (Ophthalmology) Physician Providers in South Dakota
Other clinicians with the same primary specialty enrolled in South Dakota, drawn from the same CMS NPPES roster as Thomas.
One of 5 Retina Specialist (Ophthalmology) Physician providers enrolled in South Dakota, 4 are shown here.
Dr. Prema Abraham
MD
Rapid City, SD
Dr. Jed Assam
MD
Sioux Falls, SD
Dr. Rocio Diaz Sanjur
M.D.
Rapid City, SD
Dr. Ryan Geraets
MD
Sioux Falls, SD
Compare Retina Specialist (Ophthalmology) Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Eric Thomas, M.D.'s specialty? ▼
Eric Thomas, M.D. specializes in Retina Specialist (Ophthalmology) Physician and practices in Sioux Falls, South Dakota. Credentials: M.D..
How much does Eric Thomas, M.D. prescribe under Medicare Part D? ▼
In 2024, Eric Thomas, M.D. wrote 532 Medicare Part D claims totaling $16K in drug costs for 173 beneficiaries.
Where is Eric Thomas, M.D. located? ▼
Eric Thomas, M.D. is located at 6601 S MINNESOTA AVE STE 200, Sioux Falls, SD, 57108. Phone: (605) 336-6294.
What is Eric Thomas, M.D.'s NPI number? ▼
Eric Thomas, M.D.'s National Provider Identifier (NPI) is 1588636484, issued on 02/03/2006.
Does Eric Thomas, M.D. prescribe more brand-name or generic drugs? ▼
Eric Thomas, M.D.'s prescribing is 35% brand-name and 65% generic drugs by claim count, with $9K in brand drug costs.
How many Retina Specialist (Ophthalmology) Physician providers are there in the US? ▼
There are 983 Retina Specialist (Ophthalmology) Physician providers across 48 states in the US. The average Retina Specialist (Ophthalmology) Physician provider writes 593 Medicare Part D claims per year.
What drugs does Eric Thomas, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Eric Thomas, M.D.'s most frequently prescribed drugs include Prednisolone Acetate, Atropine Sulfate, Polymyxin B Sul-Trimethoprim. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Eric Thomas, M.D. accept Medicare? ▼
Eric Thomas, M.D. appears in CMS Medicare data with 532 Part D claims and 173 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Eric Thomas, M.D.'s credentials? ▼
Eric Thomas, M.D.'s NPI is 1588636484 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 (2024). 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 August 2026 (NPPES) / 2024 (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
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 August 2026.