2026 NPPES data Ophthalmology Physician NPI 1669509550 M.D.
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Mark Fritz, M.D.

Ophthalmology Physician in Joliet, 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 22,082 in 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
2K
Medicare Part D claims · 396 beneficiaries · Ophthalmology Physician avg: 1K
Generic prescribing
67%
generic claims · 33% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
75/100
CMS neutral threshold · no category scores published

What the federal data shows

Mark Fritz, M.D. carries the neutral CMS MIPS final score of 75/100, assigned where no category was scored - and filed 1,893 Medicare Part D claims in 2023.

75/100
CMS neutral score · not measured
2K
Part D claims, 2023
67%
generic prescribing
Likely
board-certified (heuristic)

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.

Mark Fritz, M.D.'s Medicare Part D volume vs every U.S. prescriber

Total Medicare Part D claims, 2023, across all CMS prescribers nationally

1,893 ≥ 83rd percentile 83% of 1,370,886 prescribers are in lower value bands

0–200: 670,926 prescribers (49%). Below this entry. 200–400: 182,923 prescribers (13%). Below this entry. 400–600: 90,619 prescribers (7%). Below this entry. 600–800: 56,224 prescribers (4%). Below this entry. 800–1,000: 40,919 prescribers (3%). Below this entry. 1,000–1,200: 31,827 prescribers (2%). Below this entry. 1,200–1,400: 26,224 prescribers (2%). Below this entry. 1,400–1,600: 21,710 prescribers (2%). Below this entry. 1,600–1,800: 19,072 prescribers (1%). Below this entry. 1,800–2,000: 16,451 prescribers (1%). This entry sits in this band. 2K+: 213,991 prescribers (16%). Above this entry. This provider 0 2K+ every Part D prescriber (claims/yr), bucketed by value

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 · 2023

Board certification likely (heuristic, not verified)

Mark Fritz, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 Mark Fritz, M.D.?

CMS neutral score, not measured

NPI registry status

Active

Issued 02/27/2007

NPI 1669509550

Primary specialty

Ophthalmology Physician

Mid-sized

22,082 US NPIs in this specialty

Medicare Part D claims

1,893 33% vs specialty avg

2023 prescription claims

Specialty avg: 1,420

MIPS final score

75/100

CMS neutral score, not measured

No category scores published; CMS assigned the performance threshold

Specialty distribution in Illinois

How Ophthalmology Physician compares to other specialties among Illinois providers

Illinois providers
Clinical Social Worker5.2%Physical Therapist5%Mental Health Counselor4.5%Speech-Language Pathologist4.2%Student in an Organized Heal…4.2%Pharmacist4.1%Ophthalmology Physician0.4%
Largest specialties in Illinois (% of in-state providers)

MIPS score not measured

CMS assigned a neutral 75/100 threshold

CMS did not publish any Quality, Cost, Promoting Interoperability, or Improvement Activities category score for this clinician. This administrative threshold is not comparable with the national average of clinicians whose MIPS score was measured.

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).

Mark Fritz, M.D. appears in the CMS NPPES registry as an Ophthalmology Physician provider holding M.D. credentials at 212 N LARKIN AVE, Joliet, IL, 60435, with a listed phone of (815) 741-0666. NPI 1669509550 was issued on 02/27/2007.

Medicare Part D records for calendar year 2023 show 1,893 prescription claims written by this provider, covering 396 Medicare beneficiaries and totaling roughly $101K in drug spend, split 33% brand-name and 67% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider carries a Final Score of 75/100 for the 2023 performance year, but CMS published no Quality, Promoting Interoperability, Improvement Activity or Cost score: this is the neutral performance threshold CMS assigns where nothing was scored, so it is not comparable with clinicians whose score was measured.

Ophthalmology Physician is a mid-sized specialty nationwide, with 22,082 enrolled providers across 56 states and an average of 1,420 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

212 N LARKIN AVE
Joliet, IL 60435

Provider Details

NPI 1669509550
Specialty Ophthalmology Physician
Credentials M.D.
Gender Male
NPI Issued 02/27/2007

CMS Quality Score (MIPS)

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

75
Final Score
CMS neutral threshold · not measured

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 Mark Fritz, M.D.. To verify Mark Fritz, M.D.'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

Mark Fritz, M.D. - brand share 33.0%
Ophthalmology Physician average

33% brand-name claims vs 67% generic, on 1,893 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.

1,893
Total Claims
$101K
Total Drug Cost
396
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
3,010
Total Day Supply
79,784
Brand vs Generic
33% brand / 67% generic
Brand Drug Cost
$70K
Generic Drug Cost
$31K

Patient Demographics

Average Patient Age
75.1 years
Avg HCC Risk Score
1.53
Gender Split
65% female / 35% male
Age Distribution
<65: 31, 65-74: 154, 75-84: 146, 85+: 65

Top Prescribed Drugs (Medicare Part D)

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

What Mark Fritz, M.D. prescribes most

Top Medicare Part D drugs by claim count, 2023

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2023
Drug Claims
Latanoprost
560
Prednisolone Acetate
250
Ketorolac Tromethamine
212
Dorzolamide-Timolol
Dorzolamide Hcl/Timolol Maleat
186
Erythromycin
Erythromycin Base
166
Ofloxacin
150
Brimonidine Tartrate
78
Timolol Maleate
78
Dorzolamide Hcl
60
Rhopressa
Netarsudil Mesylate
16

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

Ophthalmology Physician Overview

How Mark Fritz, M.D. fits within the Ophthalmology Physician landscape nationally.

22,082
Ophthalmology Physician Providers in US
56
States with Ophthalmology Physician
1,420
Avg Claims per Provider

Mark Fritz, M.D.'s 1,893 claims are above the specialty average of 1,420.

Nearby Ophthalmology Physician Providers in Illinois

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

Compare Ophthalmology Physician 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 Ophthalmology 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.

Frequently Asked Questions

What is Mark Fritz, M.D.'s specialty?
Mark Fritz, M.D. specializes in Ophthalmology Physician and practices in Joliet, Illinois. Credentials: M.D..
How much does Mark Fritz, M.D. prescribe under Medicare Part D?
In 2023, Mark Fritz, M.D. wrote 1,893 Medicare Part D claims totaling $101K in drug costs for 396 beneficiaries.
What is Mark Fritz, M.D.'s Medicare quality score?
Mark Fritz, M.D. has a CMS MIPS Final Score of 75/100. CMS published no Quality, Promoting Interoperability, Improvement Activity or Cost score for this clinician, so the final score is the neutral performance threshold CMS assigns rather than a measured result. The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Mark Fritz, M.D. located?
Mark Fritz, M.D. is located at 212 N LARKIN AVE, Joliet, IL, 60435. Phone: (815) 741-0666.
What is Mark Fritz, M.D.'s NPI number?
Mark Fritz, M.D.'s National Provider Identifier (NPI) is 1669509550, issued on 02/27/2007.
Does Mark Fritz, M.D. prescribe more brand-name or generic drugs?
Mark Fritz, M.D.'s prescribing is 33% brand-name and 67% generic drugs by claim count, with $70K in brand drug costs.
How many Ophthalmology Physician providers are there in the US?
There are 22,082 Ophthalmology Physician providers across 56 states in the US. The average Ophthalmology Physician provider writes 1,420 Medicare Part D claims per year.
What drugs does Mark Fritz, M.D. prescribe most often?
Based on 2023 Medicare Part D data, Mark Fritz, M.D.'s most frequently prescribed drugs include Latanoprost, Prednisolone Acetate, Ketorolac Tromethamine. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Fritz, M.D. accept Medicare?
Mark Fritz, M.D. appears in CMS Medicare data with 1,893 Part D claims and 396 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Fritz, M.D.'s credentials?
Mark Fritz, M.D.'s NPI is 1669509550 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.
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

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.