2026 NPPES data Optometrist NPI 1427044692 O.D.
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THOMAS CLARK, O.D.

Optometrist in NEW ULM, Minnesota. 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
525
Medicare Part D claims · 147 beneficiaries · Optometrist avg: 257
Generic prescribing
68%
generic claims · 32% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
23.25/100
▼ 60 pts below national avg 83.1 · [object Object]
What the federal data reveals: THOMAS CLARK, O.D. is a Optometrist ([object Object]) practicing in NEW ULM, Minnesota with a Medicare Part D prescribing footprint of 525 claims across 147 beneficiaries — 32% brand-name prescribing . Their CMS MIPS Final Score of 23.25/100 (national average: 83.1) reflects performance across Quality, Cost, Interoperability, and Improvement Activities .

What stands out: THOMAS CLARK, O.D. reported a CMS MIPS final score of 23.25 out of 100, below the 83.1 national average, and filed 525 Medicare Part D claims in 2023. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

THOMAS CLARK, O.D. at a glance

Below national average

NPI registry status

Active

Issued 09/23/2005

NPI 1427044692

Primary specialty

Optometrist

High-volume

60,463 US NPIs in this specialty

Medicare Part D claims

525 104% vs specialty avg

2023 prescription claims

Specialty avg: 257

MIPS final score

23.25/100 59.849999999999994% pts

Below average band

vs 83.1 national avg

Specialty distribution in Minnesota

How Optometrist compares to other specialties among Minnesota providers

Minnesota providers

Optometrist share within Minnesota

1. Optometrist42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Optometrist share within Minnesota

Medicare quality performance — MIPS

THOMAS CLARK, O.D.'s 2023 MIPS final score plotted against the Optometrist national average

Below national average
MIPS Final Score
23.25/100
vs 83.1 national avg · 2023 performance year

MIPS final score (Optometrist) — 23.25/100 vs national avg 83.1

0%100%National avg83%23.3%
MIPS final score (Optometrist) — 23.25/100 vs national avg 83.1

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).

THOMAS CLARK, O.D. is a Optometrist provider practicing in NEW ULM, Minnesota, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: O.D.. NPI: 1427044692. This profile includes practice location, specialty classification, and organizational affiliations from the CMS provider registry. Provider information is self-reported to CMS and updated monthly.

THOMAS CLARK, O.D. appears in the CMS NPPES registry as a Optometrist provider holding O.D. credentials at 1715 S BROADWAY ST, NEW ULM, MN, 56073, with a listed phone of (507) 354-8531. NPI 1427044692 was issued on 09/23/2005. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what CLARK 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 525 prescription claims written by this provider, covering 147 Medicare beneficiaries and totaling roughly $44K in drug spend, split 32% brand-name and 68% 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. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 23.25/100 for the 2023 performance year (Quality 15), compared with the national average of 83.1.

Optometrist is a high-volume specialty nationwide, with 60,463 enrolled providers across 56 states and an average of 257 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

1715 S BROADWAY ST
NEW ULM, MN 56073

Provider Details

NPI 1427044692
Specialty Optometrist
Credentials O.D.
Gender Male
NPI Issued 09/23/2005

CMS Quality Score (MIPS)

Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.

23.25
Final Score
Avg: 83.1
15
Quality
0
Promoting Interoperability

Reporting: Group practice

Hospital and facility affiliations

Facilities where THOMAS CLARK, O.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.

DRS AKRE AND CLARK LTD
NEW ULM, MN

Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).

Brand vs generic prescribing mix · Above average

THOMAS CLARK, O.D. — brand share 32.0%
Specialty average (est.)

32% brand-name claims vs 68% generic, on 525 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.

525
Total Claims
$44K
Total Drug Cost
147
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
776
Total Day Supply
20,835
Brand vs Generic
32% brand / 68% generic
Brand Drug Cost
$31K
Generic Drug Cost
$13K

Patient Demographics

Average Patient Age
79.1 years
Avg HCC Risk Score
1.01
Gender Split
60% female / 40% male

Top Prescribed Drugs (Medicare Part D)

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

Drug Claims
Latanoprost
187
Timolol Maleate
93
Dorzolamide-Timolol
Dorzolamide Hcl/Timolol Maleat
34
Erythromycin
Erythromycin Base
21
Brimonidine Tartrate
20
Combigan
Brimonidine Tartrate/Timolol
20
Brimonidine Tartrate-Timolol
Brimonidine Tartrate/Timolol
19
Neomycin-Polymyxin-Dexameth
Neomycin/Polymyxin B/Dexametha
17
Moxifloxacin
Moxifloxacin Hcl
14
Restasis
Cyclosporine
12

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

Optometrist Overview

How THOMAS CLARK, O.D. fits within the Optometrist landscape nationally.

60,463
Optometrist Providers in US
56
States with Optometrist
257
Avg Claims per Provider

THOMAS CLARK, O.D.'s 525 claims are above the specialty average of 257.

Nearby Optometrist Providers in Minnesota

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

Compare Optometrist nationally: see state-by-state distribution →

Frequently Asked Questions

What is THOMAS CLARK, O.D.'s specialty?
THOMAS CLARK, O.D. specializes in Optometrist and practices in NEW ULM, Minnesota. Credentials: O.D..
How much does THOMAS CLARK, O.D. prescribe under Medicare Part D?
In 2023, THOMAS CLARK, O.D. wrote 525 Medicare Part D claims totaling $44K in drug costs for 147 beneficiaries.
What is THOMAS CLARK, O.D.'s Medicare quality score?
THOMAS CLARK, O.D. has a CMS MIPS Final Score of 23.25/100 (Quality: 15). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is THOMAS CLARK, O.D. located?
THOMAS CLARK, O.D. is located at 1715 S BROADWAY ST, NEW ULM, MN, 56073. Phone: (507) 354-8531.
What is THOMAS CLARK, O.D.'s NPI number?
THOMAS CLARK, O.D.'s National Provider Identifier (NPI) is 1427044692, issued on 09/23/2005.
Does THOMAS CLARK, O.D. prescribe more brand-name or generic drugs?
THOMAS CLARK, O.D.'s prescribing is 32% brand-name and 68% generic drugs by claim count, with $31K in brand drug costs.
How many Optometrist providers are there in the US?
There are 60,463 Optometrist providers across 56 states in the US. The average Optometrist provider writes 257 Medicare Part D claims per year.
What drugs does THOMAS CLARK, O.D. prescribe most often?
Based on 2023 Medicare Part D data, THOMAS CLARK, O.D.'s most frequently prescribed drugs include Latanoprost, Timolol Maleate, Dorzolamide-Timolol. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does THOMAS CLARK, O.D. accept Medicare?
THOMAS CLARK, O.D. appears in CMS Medicare data with 525 Part D claims and 147 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify THOMAS CLARK, O.D.'s credentials?
THOMAS CLARK, O.D.'s NPI is 1427044692 with credentials O.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

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.
Quality Performance
CMS Merit-based Incentive Payment System (MIPS) — 2023 performance year.
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