NPI registry status
Active
2026 NPPES data Optometrist NPI 1588766281 OD
Verify on CMS → Nikolas Diemer, OD
Optometrist in Freeport, Illinois.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 60,484 in Optometrist, 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
580
Medicare Part D claims · 150 beneficiaries · Optometrist avg: 257
Generic prescribing
75%
generic claims · 25% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
87.7/100
▲ 5 pts above national avg 83.1 · Above neutral
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
Nikolas Diemer, OD reported a CMS MIPS final score of 87.7/100 - above the 83.1 national average - and filed 580 Medicare Part D claims in 2023.
- 87.7/100
- MIPS score · +5 vs avg
- 580
- Part D claims, 2023
- 75%
- 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.
Nikolas Diemer, OD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
88 Top 46% higher than 54% of 477,587 scored providers
Each bar is a band; taller bars hold more scored providers. 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 Merit-based Incentive Payment System (MIPS) · 2023
Where Nikolas Diemer, OD sits
This provider among optometrist peers
Across the 6,527 optometrist providers who report both Medicare Part D prescribing and a MIPS quality score, Nikolas Diemer, OD writes more Part D claims than 68% of them and scores higher on MIPS quality than 56% - placing this provider in the high-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one optometrist peer from a representative sample of 60; the gold marker is Nikolas Diemer, OD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
What does the federal data show about Nikolas Diemer, OD?
High performer (top quartile)Primary specialty
Optometrist
Medicare Part D claims
580 126% vs specialty avg
MIPS final score
87.7/100 4.6 pts vs avg
Specialty distribution in Illinois
How Optometrist compares to other specialties among Illinois providers
Medicare quality performance, MIPS
Nikolas Diemer, OD's 2023 MIPS final score plotted against the Optometrist national average
- MIPS Final Score
- 87.7/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Optometrist) - 87.7/100 vs national avg 83.1
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).
Nikolas Diemer, OD appears in the CMS NPPES registry as an Optometrist provider holding OD credentials at 1000 KIWANIS DR, Freeport, IL, 61032, with a listed phone of (815) 235-6177. NPI 1588766281 was issued on 09/02/2006.
Medicare Part D records for calendar year 2023 show 580 prescription claims written by this provider, covering 150 Medicare beneficiaries and totaling roughly $46K in drug spend, split 25% brand-name and 75% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 87.7/100 for the 2023 performance year (Quality 75.4), compared with the national average of 83.1.
Optometrist is a high-volume specialty nationwide, with 60,484 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
Provider Details
| NPI | 1588766281 |
|---|---|
| Specialty | Optometrist |
| Credentials | OD |
| Gender | Male |
| NPI Issued | 09/02/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
87.6973
Final Score
Avg: 83.1
75.3947
Quality
Reporting: Group practice
License & disciplinary context - Illinois IDFPR 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~42K Illinois medical licensees in 2023 - they are NOT specific to Nikolas Diemer, OD. To verify Nikolas Diemer, OD's current license status, search the IDFPR public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
106
Total board actions, Illinois 2023
Across 103 cases
2.52
Actions per 1,000 licensees
Illinois statewide rate
probation
Most common action type
38 cases
IDFPR publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Illinois disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Above average
Nikolas Diemer, OD - brand share 25.0%
Optometrist average
25% brand-name claims vs 75% generic, on 580 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.
580
Total Claims
$46K
Total Drug Cost
150
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,361
- Total Day Supply
- 39,997
- Brand vs Generic
- 25% brand / 75% generic
- Brand Drug Cost
- $36K
- Generic Drug Cost
- $10K
Patient Demographics
- Average Patient Age
- 76.8 years
- Avg HCC Risk Score
- 0.97
- Gender Split
- 63% female / 37% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Nikolas Diemer, OD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Latanoprost
Latanoprost
319 claims
- Timolol Maleate 110
Timolol Maleate
110 claims
- Brimonidine Tartrate 36
Brimonidine Tartrate
36 claims
- Prednisolone Acetate 25
Prednisolone Acetate
25 claims
- Restasis 13
Restasis
13 claims
- Dorzolamide-Timolol 11
Dorzolamide-Timolol
11 claims
| Drug | Claims |
|---|---|
| Latanoprost | 319 |
| Timolol Maleate | 110 |
| Brimonidine Tartrate | 36 |
| Prednisolone Acetate | 25 |
| Restasis Cyclosporine | 13 |
| Dorzolamide-Timolol Dorzolamide Hcl/Timolol Maleat | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Optometrist Overview
How Nikolas Diemer, OD fits within the Optometrist landscape nationally.
60,484
Optometrist Providers in US
56
States with Optometrist
257
Avg Claims per Provider
Nikolas Diemer, OD's 580 claims are above the specialty average of 257.
Nearby Optometrist Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Diemer.
Dr. Marvin Aal
O.D.
Chicago, IL
Dr. Russul Abbas
OD
Gurnee, IL
Dr. Sarah Abbott
OD
Park Ridge, IL
Dr. Mahmud Abdallah
OD
Alsip, IL
Nada Abdallah
Deerfield, IL
Compare Optometrist 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 Illinois medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Optometrist 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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Frequently Asked Questions
What is Nikolas Diemer, OD's specialty? ▼
Nikolas Diemer, OD specializes in Optometrist and practices in Freeport, Illinois. Credentials: OD.
How much does Nikolas Diemer, OD prescribe under Medicare Part D? ▼
In 2023, Nikolas Diemer, OD wrote 580 Medicare Part D claims totaling $46K in drug costs for 150 beneficiaries.
What is Nikolas Diemer, OD's Medicare quality score? ▼
Nikolas Diemer, OD has a CMS MIPS Final Score of 87.7/100 (Quality: 75.4). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Nikolas Diemer, OD located? ▼
Nikolas Diemer, OD is located at 1000 KIWANIS DR, Freeport, IL, 61032. Phone: (815) 235-6177.
What is Nikolas Diemer, OD's NPI number? ▼
Nikolas Diemer, OD's National Provider Identifier (NPI) is 1588766281, issued on 09/02/2006.
Does Nikolas Diemer, OD prescribe more brand-name or generic drugs? ▼
Nikolas Diemer, OD's prescribing is 25% brand-name and 75% generic drugs by claim count, with $36K in brand drug costs.
How many Optometrist providers are there in the US? ▼
There are 60,484 Optometrist providers across 56 states in the US. The average Optometrist provider writes 257 Medicare Part D claims per year.
What drugs does Nikolas Diemer, OD prescribe most often? ▼
Based on 2023 Medicare Part D data, Nikolas Diemer, OD's most frequently prescribed drugs include Latanoprost, Timolol Maleate, Brimonidine Tartrate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Nikolas Diemer, OD accept Medicare? ▼
Nikolas Diemer, OD appears in CMS Medicare data with 580 Part D claims and 150 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Nikolas Diemer, OD's credentials? ▼
Nikolas Diemer, OD's NPI is 1588766281 with credentials OD. 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.
- 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
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.