2026 NPPES data Optometrist NPI 1952423139 O.D.
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TIMOTHY FAHY, O.D.

Optometrist in CHICAGO, Illinois. 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
110
Medicare Part D claims · 29 beneficiaries · Optometrist avg: 257
Generic prescribing
43%
generic claims · 57% brand-name · higher generic rates reduce patient out-of-pocket costs

What the federal data shows

TIMOTHY FAHY, O.D. filed 110 Medicare Part D claims in 2023 as a Optometrist in CHICAGO, Illinois, prescribing 43% generic.

110
Part D claims, 2023
43%
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.

TIMOTHY FAHY, O.D.'s Medicare Part D volume vs every U.S. prescriber

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

110 35th percentile higher than 35% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). This entry sits in this band. 200–400: 182,923 prescribers (13%). Above this entry. 400–600: 90,619 prescribers (7%). Above this entry. 600–800: 56,224 prescribers (4%). Above this entry. 800–1,000: 40,919 prescribers (3%). Above this entry. 1,000–1,200: 31,827 prescribers (2%). Above this entry. 1,200–1,400: 26,224 prescribers (2%). Above this entry. 1,400–1,600: 21,710 prescribers (2%). Above this entry. 1,600–1,800: 19,072 prescribers (1%). Above this entry. 1,800–2,000: 16,451 prescribers (1%). Above this entry. 2,000–2,200: 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.

Source CMS Medicare Part D Prescriber Public Use File · 2023

What does the federal data show about TIMOTHY FAHY, O.D.?

Quality data not reported

NPI registry status

Active

Issued 04/06/2007

NPI 1952423139

Primary specialty

Optometrist

High-volume

60,463 US NPIs in this specialty

Medicare Part D claims

110 57% vs specialty avg

2023 prescription claims

Specialty avg: 257

Specialty distribution in Illinois

How Optometrist compares to other specialties among Illinois providers

Illinois providers

Optometrist share within Illinois

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

Specialty board-certification context

Estimated specialty board-certified rate — Optometrist (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Optometrist ABMS/AOA estimate

Est. board-certified rate (Optometrist) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Optometrist) — ABMS / AOA estimate

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).

TIMOTHY FAHY, O.D. appears in the CMS NPPES registry as a Optometrist provider holding O.D. credentials at 5943 W MONTROSE AVE, CHICAGO, IL, 60634, with a listed phone of (773) 685-0363. NPI 1952423139 was issued on 04/06/2007. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what FAHY 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 110 prescription claims written by this provider, covering 29 Medicare beneficiaries and totaling roughly $19K in drug spend, split 57% brand-name and 43% 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.

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

5943 W MONTROSE AVE
CHICAGO, IL 60634

Provider Details

NPI 1952423139
Specialty Optometrist
Credentials O.D.
Gender Male
NPI Issued 04/06/2007

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 TIMOTHY FAHY, O.D.. To verify TIMOTHY FAHY, O.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 · Brand-heavy

TIMOTHY FAHY, O.D. — brand share 57.0%
Specialty average (est.)

57% brand-name claims vs 43% generic, on 110 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.

110
Total Claims
$19K
Total Drug Cost
29
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
190
Total Day Supply
4,959
Brand vs Generic
57% brand / 43% generic
Brand Drug Cost
$17K
Generic Drug Cost
$1K

Patient Demographics

Average Patient Age
76.8 years
Avg HCC Risk Score
1.35
Gender Split
62% female / 38% 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
42
Brimonidine Tartrate
13

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

Optometrist Overview

How TIMOTHY FAHY, O.D. fits within the Optometrist landscape nationally.

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

TIMOTHY FAHY, O.D.'s 110 claims are below 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 FAHY.

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

Frequently Asked Questions

What is TIMOTHY FAHY, O.D.'s specialty?
TIMOTHY FAHY, O.D. specializes in Optometrist and practices in CHICAGO, Illinois. Credentials: O.D..
How much does TIMOTHY FAHY, O.D. prescribe under Medicare Part D?
In 2023, TIMOTHY FAHY, O.D. wrote 110 Medicare Part D claims totaling $19K in drug costs for 29 beneficiaries.
Where is TIMOTHY FAHY, O.D. located?
TIMOTHY FAHY, O.D. is located at 5943 W MONTROSE AVE, CHICAGO, IL, 60634. Phone: (773) 685-0363.
What is TIMOTHY FAHY, O.D.'s NPI number?
TIMOTHY FAHY, O.D.'s National Provider Identifier (NPI) is 1952423139, issued on 04/06/2007.
Does TIMOTHY FAHY, O.D. prescribe more brand-name or generic drugs?
TIMOTHY FAHY, O.D.'s prescribing is 57% brand-name and 43% generic drugs by claim count, with $17K 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 TIMOTHY FAHY, O.D. prescribe most often?
Based on 2023 Medicare Part D data, TIMOTHY FAHY, O.D.'s most frequently prescribed drugs include Latanoprost, Brimonidine Tartrate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does TIMOTHY FAHY, O.D. accept Medicare?
TIMOTHY FAHY, O.D. appears in CMS Medicare data with 110 Part D claims and 29 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify TIMOTHY FAHY, O.D.'s credentials?
TIMOTHY FAHY, O.D.'s NPI is 1952423139 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.
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