Dr. David John Massop, MD
- Medicare services, 2024
- 140,288
- Medicare patients, 2024
- 1,303
- Part D claims, 2024
- 615
- Industry payments
- $3,000
- Affiliated sites
- 1
- Practice address
- 309 E Church St, Marshalltown, IA 50158-2946
- Practice phone
- Call (641) 754-6200
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Wolfe Eye Clinic- Marshalltown
Eye care practice · Marshalltown, Iowa
Find Dr. Massop's professional email, personal email and mobile number
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Dr. David John Massop is a retina specialist (ophthalmology) physician in Marshalltown, Iowa
Dr. Massop practices at Wolfe Eye Clinic- Marshalltown in Marshalltown, Iowa.
Dr. Massop's NPI, 1003267956, was assigned on June 22, 2016. Dr. Massop graduated from Creighton University School of Medicine in 2016. Dr. Massop holds Iowa license 47004.
- NPI
- 1003267956NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8628362365
- NPI enumeration date
- June 22, 2016
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (641) 754-6200
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 36
- Medical school graduation
- 2016
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. David John Massop practices at Wolfe Eye Clinic- Marshalltown in Marshalltown, Iowa
Dr. Massop's primary practice is Wolfe Eye Clinic- Marshalltown, at 309 E Church St, Marshalltown, IA 50158-2946. The practice phone is (641) 754-6200.
- Wolfe Eye Clinic- Marshalltown309 E Church St, Marshalltown, IA 50158-2946Phone(641) 754-6200
Source: Dmand AI Affiliation Data
Dr. David John Massop is affiliated with 1 site of care and 1 medical group
Dr. Massop's primary practice is Wolfe Eye Clinic- Marshalltown in Marshalltown, Iowa. Dmand AI also links Dr. Massop to 1 medical group, named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. David John Massop's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Massop practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Wolfe Eye Clinic- Marshalltown | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. David John Massop is one of 8 retina specialist (ophthalmology) physicians in Iowa
Retina specialist is Dr. Massop's primary specialty in the NPI Registry, under taxonomy code 207WX0107X. Dr. Massop is board certified in ophthalmology by the American Board of Ophthalmology. Dr. Massop is licensed in Iowa.
Specialties and state licenses
- Retina specialist (ophthalmology), IowaPrimary
Retina specialist (ophthalmology) physicians near Dr. Massop
Counts of retina specialist (ophthalmology) physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. David John Massop billed Medicare for 140,288 services in 2024
CMS data shows 140,288 Medicare services from Dr. Massop across 26 procedure codes in 2024, for 1,303 Medicare patients. Medicare paid $4,837,843 for them.
Dr. Massop's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Drugs given in the office
- 2023: 88,8272024: 132,51749%
- Tests and treatments
- 2023: 3,3712024: 3,92616%
- Surgery
- 2023: 2,2062024: 2,74224%
- Office and hospital visits
- 2023: 9152024: 1,08719%
- Imaging
- 2023: 192024: 1616%
Where Dr. Massop's Medicare services took place, 2024
- In an office140,238100%
- In a facility500%
Dr. Massop's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Source: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data
Dr. David John Massop treated 1,303 Medicare patients in 2024, average age 78
CMS counts 1,303 Medicare patients who saw Dr. Massop in 2024. The largest group is 65 to 74, with 470 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 6% are also on Medicaid. Their average risk score is 1.51, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Massop's median patient age at 72, with 56% women.
Dr. Massop's Medicare patients by age, 2024
Dr. Massop's Medicare patients by sex, 2024
- Women76859%
- Men53541%
Chronic conditions among Dr. Massop's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis41%
- Diabetes36%
- Chronic kidney disease34%
- Ischemic heart disease24%
- Mood disorders23%
- Depression22%
Share of Medicare patients with each condition. A patient can have several.
Dr. Massop's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 72
Patient panel by sex, all payers
- Women56%
- Men43%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. David John Massop wrote 615 Medicare Part D claims in 2024
In 2024, Dr. Massop wrote 615 Medicare Part D claims for 213 patients. 55% of them were for generic drugs. CMS names the drug for 567 of them, across 7 drugs with 11 or more claims each, at $18,159 in total drug cost. In 2023, CMS named 500 claims across 9 drugs.
Dr. Massop's Part D claims by kind of drug, 2024
- Generic341 claims55%
- Brand-name274 claims45%
Dr. Massop's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 5002024: 56713%
Drugs named by CMS: 7 in 2024, 9 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. David John Massop ranks in the 45th percentile for cataract surgery in Medicare
Dr. Massop accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 20 procedures of cataract surgery by Dr. Massop, more than 45% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Massop ranks in Medicare procedure volume
- Cataract surgery
- 45th percentile20 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. David John Massop received $3,000 in industry payments from 2017 to 2025
CMS Open Payments shows 40 general payments to Dr. Massop from 15 drug and device companies from 2017 to 2025. Food and beverage make up the largest share, 81% of the total. Bausch Health Americas, Inc. paid the most, $624.
General payments to Dr. Massop by program year, 2017 to 2025
General payments to Dr. Massop by kind, 2017 to 2025
- Food and beverage$2,42181%
- Travel and lodging$48116%
- Education$983%
Companies that paid Dr. Massop the most, 2017 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. David John Massop graduated from Creighton University School of Medicine
Dr. Massop graduated from Creighton University School of Medicine in 2016.
- Medical school
- Board certified in ophthalmology
Source: Dmand AI Professional Profile Data
Sources for Dr. David John Massop's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. David John Massop
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What is Dr. David John Massop's NPI number?
Dr. David John Massop's NPI number is 1003267956. It was assigned on June 22, 2016, and it is active in the NPI Registry.
What kind of doctor is Dr. David John Massop?
Dr. David John Massop is a retina specialist (ophthalmology) physician in Marshalltown, Iowa. The primary specialty in the NPI Registry is Retina Specialist (Ophthalmology) Physician (taxonomy code 207WX0107X).
Where does Dr. David John Massop practice?
Dr. Massop practices at 309 E Church St, Marshalltown, IA 50158-2946. Dr. Massop's primary practice is Wolfe Eye Clinic- Marshalltown in Marshalltown, Iowa. Dmand AI also links Dr. Massop to 1 medical group.
What is Dr. David John Massop's office phone number?
The practice phone on file for Dr. Massop is (641) 754-6200.
What is Dr. David John Massop's medical license number?
Dr. Massop holds Iowa license 47004.
Does Dr. David John Massop accept Medicare?
Yes. CMS data shows Dr. Massop billed Medicare for 140,288 services in 2024, and Dr. Massop accepts Medicare assignment.
How many Medicare patients does Dr. David John Massop see?
CMS counts 1,303 Medicare patients who saw Dr. Massop in 2024, with an average age of 78.
Is Dr. David John Massop board certified?
Yes. Dr. Massop is board certified in ophthalmology by the American Board of Ophthalmology.
What services does Dr. David John Massop bill to Medicare?
In 2024, Dr. Massop's most billed Medicare services were injected or infused drug (J2777), eye exam or test (92134) and surgery: eye (67028).
Where did Dr. David John Massop go to medical school?
Dr. Massop graduated from Creighton University School of Medicine in 2016.
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What drugs does Dr. David John Massop prescribe most?
In 2024 Medicare Part D data, Dr. Massop's most prescribed drugs by claims were Prednisolone Acetate, Moxifloxacin and Dorzolamide-Timolol.
Has Dr. David John Massop received payments from drug or device companies?
CMS Open Payments shows $3,000 in general payments to Dr. Massop from 15 companies from 2017 to 2025. The largest total came from Bausch Health Americas, Inc.
How long has Dr. David John Massop been practicing?
Dr. Massop graduated from medical school in 2016, 10 years ago.
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