NPI registry status
Active
2026 NPPES data Retina Specialist (Ophthalmology) Physician NPI 1003267956 MD
Verify on CMS → David Massop, MD
Retina Specialist (Ophthalmology) Physician in Des Moines, 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 913 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
520
Medicare Part D claims · 179 beneficiaries · Retina Specialist (Ophthalmology) Physician avg: 558
Generic prescribing
50%
generic claims · 50% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$739.59
11 payments · CMS Open Payments (Sunshine Act)
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
David Massop, MD filed 520 Medicare Part D claims in 2023 as a Retina Specialist (Ophthalmology) Physician in Des Moines, Iowa, prescribing 50% generic.
- 520
- Part D claims, 2023
- 50%
- 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.
David Massop, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
520 Top 34% higher than 66% of 1,370,886 prescribers
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
✓
Board certification likely (heuristic, not verified)
David Massop, MD 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 David Massop, MD?
Quality data not reportedPrimary specialty
Retina Specialist (Ophthalmology) Physician
Medicare Part D claims
520 7% 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).
David Massop, MD appears in the CMS NPPES registry as a Retina Specialist (Ophthalmology) Physician provider holding MD credentials at 1415 WOODLAND AVE, Des Moines, IA, 50309, with a listed phone of (515) 241-8595. NPI 1003267956 was issued on 06/22/2016.
Medicare Part D records for calendar year 2023 show 520 prescription claims written by this provider, covering 179 Medicare beneficiaries and totaling roughly $22K in drug spend, split 50% brand-name and 50% generic by claim count.
Retina Specialist (Ophthalmology) Physician is a narrow specialty nationwide, with 913 enrolled providers across 48 states and an average of 558 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 | 1003267956 |
|---|---|
| Specialty | Retina Specialist (Ophthalmology) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 06/22/2016 |
Hospital and facility affiliations
Facilities where David Massop, MD 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.
Wolfe Clinic Inc
Spencer, 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).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for David Massop, MD. Source: openpaymentsdata.cms.gov.
Total received
$740
Largest payer
Dutch Ophthalmic, USA
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
Brand vs generic prescribing mix · Brand-heavy
David Massop, MD - brand share 50.0%
Retina Specialist (Ophthalmology) Physician average
50% brand-name claims vs 50% generic, on 520 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.
520
Total Claims
$22K
Total Drug Cost
179
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 687
- Total Day Supply
- 17,888
- Brand vs Generic
- 50% brand / 50% generic
- Brand Drug Cost
- $15K
- Generic Drug Cost
- $7K
Patient Demographics
- Average Patient Age
- 74.4 years
- Avg HCC Risk Score
- 1.24
- Gender Split
- 46% female / 54% male
- Age Distribution
- <65: 13, 65-74: 93, 75-84: 49, 85+: 24
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What David Massop, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Prednisolone Acetate
Prednisolone Acetate
237 claims
- Moxifloxacin
Moxifloxacin
100 claims
- Dorzolamide-Timolol 43
Dorzolamide-Timolol
43 claims
- Latanoprost 35
Latanoprost
35 claims
- Dorzolamide Hcl 20
Dorzolamide Hcl
20 claims
- Timolol Maleate 20
Timolol Maleate
20 claims
- Brimonidine Tartrate 19
Brimonidine Tartrate
19 claims
- Polymyxin B Sul-Tr… 13
Polymyxin B Sul-Trimethoprim
13 claims
| Drug | Claims |
|---|---|
| Prednisolone Acetate | 237 |
| Moxifloxacin Moxifloxacin Hcl | 100 |
| Dorzolamide-Timolol Dorzolamide Hcl/Timolol Maleat | 43 |
| Latanoprost | 35 |
| Dorzolamide Hcl | 20 |
| Timolol Maleate | 20 |
| Brimonidine Tartrate | 19 |
| Polymyxin B Sul-Trimethoprim Polymyxin B Sulf/Trimethoprim | 13 |
| Prednisone | 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 David Massop, MD fits within the Retina Specialist (Ophthalmology) Physician landscape nationally.
913
Retina Specialist (Ophthalmology) Physician Providers in US
48
States with Retina Specialist (Ophthalmology) Physician
558
Avg Claims per Provider
David Massop, MD's 520 claims are below the specialty average of 558.
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 Massop.
Dr. Michael Abramoff
MD, PHD
Iowa City, IA
Dr. Timothy Boyce
M.D.
Iowa City, IA
Dr. Beau Fenner
MD
Iowa City, IA
Dr. Taariq Mohammed
MD
Iowa City, IA
Dr. Mohammad Sabbagh
MD
Sioux City, IA
Compare Retina Specialist (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 Iowa medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Retina Specialist (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.
Healthcare Guides
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Iowa
Frequently Asked Questions
What is David Massop, MD's specialty? ▼
David Massop, MD specializes in Retina Specialist (Ophthalmology) Physician and practices in Des Moines, Iowa. Credentials: MD.
How much does David Massop, MD prescribe under Medicare Part D? ▼
In 2023, David Massop, MD wrote 520 Medicare Part D claims totaling $22K in drug costs for 179 beneficiaries.
Where is David Massop, MD located? ▼
David Massop, MD is located at 1415 WOODLAND AVE, Des Moines, IA, 50309. Phone: (515) 241-8595.
What is David Massop, MD's NPI number? ▼
David Massop, MD's National Provider Identifier (NPI) is 1003267956, issued on 06/22/2016.
Does David Massop, MD prescribe more brand-name or generic drugs? ▼
David Massop, MD's prescribing is 50% brand-name and 50% generic drugs by claim count, with $15K in brand drug costs.
How many Retina Specialist (Ophthalmology) Physician providers are there in the US? ▼
There are 913 Retina Specialist (Ophthalmology) Physician providers across 48 states in the US. The average Retina Specialist (Ophthalmology) Physician provider writes 558 Medicare Part D claims per year.
What drugs does David Massop, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, David Massop, MD's most frequently prescribed drugs include Prednisolone Acetate, Moxifloxacin, Dorzolamide-Timolol. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does David Massop, MD accept Medicare? ▼
David Massop, MD appears in CMS Medicare data with 520 Part D claims and 179 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify David Massop, MD's credentials? ▼
David Massop, MD's NPI is 1003267956 with credentials MD. 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.
- 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.