NPI registry status
Active
2026 NPPES data Retina Specialist (Ophthalmology) Physician NPI 1962880393 M.D.
Verify on CMS → Timothy Boyce, M.D.
Retina Specialist (Ophthalmology) Physician in Iowa City, Iowa.
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
382
Medicare Part D claims · 104 beneficiaries · Retina Specialist (Ophthalmology) Physician avg: 593
Generic prescribing
79%
generic claims · 21% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Timothy Boyce, M.D. filed 382 Medicare Part D claims in 2024 as a Retina Specialist (Ophthalmology) Physician in Iowa City, Iowa, prescribing 79% generic.
- 382
- Part D claims, 2024
- 79%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥56th
- 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 Timothy Boyce, 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 1962880393), first enumerated 05/18/2015.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 382 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
- 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 1962880393 · Retina Specialist (Ophthalmology) Physician
NPI-10 · ENUM-MID · TAX-NARROW · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1962880393
- ENUM-MID 2015
- TAX-NARROW 983
- RX-LIGHT 382
- BOOK-THIN 12 in Iowa
- PHOTO-ENUM Kirk Hou · 2015
Timothy Boyce, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
382 ≥ 56th percentile 56% 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)
Timothy Boyce, 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 Timothy Boyce, M.D.?
Quality data not reportedPrimary specialty
Retina Specialist (Ophthalmology) Physician
Medicare Part D claims
382 36% vs specialty avg
Specialty distribution in Iowa
How Retina Specialist (Ophthalmology) Physician compares to other specialties among Iowa 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 | 1962880393 |
|---|---|
| Specialty | Retina Specialist (Ophthalmology) Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 05/18/2015 |
Hospital and facility affiliations
Facilities where Timothy Boyce, 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.
State University OF Iowa
Iowa City, IA
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 · Typical
Timothy Boyce, M.D. - brand share 21.0%
Retina Specialist (Ophthalmology) Physician average
21% brand-name claims vs 79% generic, on 382 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.
382
Total Claims
$11K
Total Drug Cost
104
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 596.767
- Total Day Supply
- 16,789
- Brand vs Generic
- 21% brand / 79% generic
- Brand Drug Cost
- $4K
- Generic Drug Cost
- $7K
Patient Demographics
- Average Patient Age
- 72.6 years
- Avg HCC Risk Score
- 1.35
- Gender Split
- 51% female / 49% male
- Age Distribution
- <65: 11, 65-74: 54, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Timothy Boyce, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Prednisone
Prednisone
75 claims
- Prednisolone Acetate
Prednisolone Acetate
69 claims
- Dorzolamide-Timolol
Dorzolamide-Timolol
48 claims
- Ketorolac Trometha…
Ketorolac Tromethamine
35 claims
- Brimonidine Tartrate
Brimonidine Tartrate
34 claims
- Latanoprost
Latanoprost
33 claims
- Acetazolamide 16
Acetazolamide
16 claims
- Difluprednate 16
Difluprednate
16 claims
| Drug | Claims |
|---|---|
| Prednisone | 75 |
| Prednisolone Acetate | 69 |
| Dorzolamide-Timolol Dorzolamide Hcl/Timolol Maleat | 48 |
| Ketorolac Tromethamine | 35 |
| Brimonidine Tartrate | 34 |
| Latanoprost | 33 |
| Acetazolamide | 16 |
| Difluprednate | 16 |
| Timolol Maleate | 13 |
* 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 IA →
All providers in Iowa →
Compare specialties →
Retina Specialist (Ophthalmology) Physician Overview
How Timothy Boyce, 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
Timothy Boyce, M.D.'s 382 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 Boyce, both outside Iowa so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2015)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Retina Specialist (Ophthalmology) Physician Providers in Iowa
Other clinicians with the same primary specialty enrolled in Iowa, drawn from the same CMS NPPES roster as Boyce.
One of 12 Retina Specialist (Ophthalmology) Physician providers enrolled in Iowa, 5 are shown here.
Dr. Michael Abramoff
MD, PHD
Iowa City, IA
Dr. Cory Christensen
DO, MPH
West Des Moines, IA
Dr. Beau Fenner
MD
Iowa City, IA
Dr. David Massop
MD
Des Moines, IA
Dr. Taariq Mohammed
MD
Iowa City, IA
Compare Retina Specialist (Ophthalmology) Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Timothy Boyce, M.D.'s specialty? ▼
Timothy Boyce, M.D. specializes in Retina Specialist (Ophthalmology) Physician and practices in Iowa City, Iowa. Credentials: M.D..
How much does Timothy Boyce, M.D. prescribe under Medicare Part D? ▼
In 2024, Timothy Boyce, M.D. wrote 382 Medicare Part D claims totaling $11K in drug costs for 104 beneficiaries.
Where is Timothy Boyce, M.D. located? ▼
Timothy Boyce, M.D. is located at 200 HAWKINS DR, Iowa City, IA, 52242. Phone: (319) 356-3185.
What is Timothy Boyce, M.D.'s NPI number? ▼
Timothy Boyce, M.D.'s National Provider Identifier (NPI) is 1962880393, issued on 05/18/2015.
Does Timothy Boyce, M.D. prescribe more brand-name or generic drugs? ▼
Timothy Boyce, M.D.'s prescribing is 21% brand-name and 79% generic drugs by claim count, with $4K 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 Timothy Boyce, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Timothy Boyce, M.D.'s most frequently prescribed drugs include Prednisone, Prednisolone Acetate, Dorzolamide-Timolol. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Timothy Boyce, M.D. accept Medicare? ▼
Timothy Boyce, M.D. appears in CMS Medicare data with 382 Part D claims and 104 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Timothy Boyce, M.D.'s credentials? ▼
Timothy Boyce, M.D.'s NPI is 1962880393 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.