Dr. Walter F. Nieves, MD
- Medicare services, 2024
- 25
- Medicare patients, 2024
- 24
- Part D claims, 2024
- 2,872
- Industry payments
- $135
- Affiliated sites
- 1
- Practice address
- 3285 Ave Militar, Isabela, PR 00662
- Practice phone
- Call (787) 830-5784
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Islabella Vision Inc.
Physician office · Isabela, Puerto Rico
Find Dr. Nieves' professional email, personal email and mobile number
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Dr. Walter F. Nieves is an ophthalmologist in Isabela, Puerto Rico
Dr. Nieves practices at Islabella Vision Inc. in Isabela, Puerto Rico.
Dr. Nieves' NPI, 1225007453, was assigned on March 17, 2006. Dr. Nieves graduated from University of Puerto Rico School of Medicine in 1994. Dr. Nieves holds Puerto Rico license 12791.
- NPI
- 1225007453NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4880887926
- NPI enumeration date
- March 17, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (787) 830-5784
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 58
- Medical school graduation
- 1994
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Walter F. Nieves practices at Islabella Vision Inc. in Isabela, Puerto Rico
Dr. Nieves' primary practice is Islabella Vision Inc., at 3285 Ave Militar, Isabela, PR 00662. The practice phone is (787) 830-5784.
- Islabella Vision Inc.3285 Ave Militar, Isabela, PR 00662Phone(787) 830-5784
Source: Dmand AI Affiliation Data
Dr. Walter F. Nieves is affiliated with 1 site of care
Dr. Nieves' primary practice is Islabella Vision Inc. in Isabela, Puerto Rico.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Walter F. Nieves' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Nieves practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Islabella Vision Inc. | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Walter F. Nieves is one of 188 ophthalmologists in Puerto Rico
Ophthalmology is Dr. Nieves' primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Nieves is licensed in Puerto Rico.
Specialties and state licenses
- Ophthalmology, Puerto RicoPrimary
Ophthalmologists near Dr. Nieves
Counts of ophthalmologists 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. Walter F. Nieves billed Medicare for 25 services in 2024
CMS data shows 25 Medicare services from Dr. Nieves across 1 procedure code in 2024, for 24 Medicare patients. Medicare paid $1,234 for them. Every service was in an office.
Dr. Nieves' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 282024: 2511%
Dr. Nieves compared with the Puerto Rico median for ophthalmologists, 2024
- Dr. Nieves
- Puerto Rico median
- Medicare services
- 25vs 12079% below
- Medicare patients
- 24vs 5859% below
- Part D claims
- 2,828vs 2,6198% above
Medians across 196 ophthalmologists in Puerto Rico with Dmand AI profiles that report each measure.
Dr. Nieves' 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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Nieves and other ophthalmologists in Puerto Rico.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Walter F. Nieves treated 24 Medicare patients in 2024, average age 75
CMS counts 24 Medicare patients who saw Dr. Nieves in 2024. The largest group is 65 to 74, with 13 patients. 75% of them have high cholesterol, and 67% have high blood pressure. Their average risk score is 1.06, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Nieves' median patient age at 64, with 78% women.
Dr. Nieves' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among Dr. Nieves' Medicare patients, 2024
- High cholesterol75%
- High blood pressure67%
- Diabetes54%
Share of Medicare patients with each condition. A patient can have several.
Dr. Nieves' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 64
Patient panel by sex, all payers
- Women78%
- Men22%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Walter F. Nieves wrote 2,872 Medicare Part D claims in 2024
In 2024, Dr. Nieves wrote 2,872 Medicare Part D claims for 415 patients. 68% of them were for generic drugs. CMS names the drug for 2,828 of them, across 15 drugs with 11 or more claims each, at $85,707 in total drug cost. In 2023, CMS named 3,030 claims across 19 drugs.
Dr. Nieves' Part D claims by kind of drug, 2024
- Generic1,964 claims68%
- Brand-name908 claims32%
Dr. Nieves' 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: 3,0302024: 2,8287%
Drugs named by CMS: 15 in 2024, 19 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. Walter F. Nieves ranks in the 41st percentile for cataract surgery in Medicare
Dr. Nieves accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 17 procedures of cataract surgery by Dr. Nieves, more than 41% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Nieves ranks in Medicare procedure volume
- Cataract surgery
- 41st percentile17 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. Walter F. Nieves received $135 in industry payments from 2016 to 2021
CMS Open Payments shows 2 general payments to Dr. Nieves from 2 drug and device companies from 2016 to 2021. Device or supply loans make up the largest share, 72% of the total. Alcon Laboratories Inc paid the most, $97.
General payments to Dr. Nieves by program year, 2016 to 2021
General payments to Dr. Nieves by kind, 2016 to 2021
- Device or supply loans$9772%
- Education$3828%
Companies that paid Dr. Nieves the most, 2016 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Walter F. Nieves graduated from University of Puerto Rico School of Medicine
Dr. Nieves graduated from University of Puerto Rico School of Medicine in 1994.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Walter F. Nieves'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) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| 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. Walter F. Nieves
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Walter F. Nieves' NPI number?
Dr. Walter F. Nieves' NPI number is 1225007453. It was assigned on March 17, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Walter F. Nieves?
Dr. Walter F. Nieves is an ophthalmologist in Isabela, Puerto Rico. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. Walter F. Nieves practice?
Dr. Nieves practices at 3285 Ave Militar, Isabela, PR 00662. Dr. Nieves' primary practice is Islabella Vision Inc. in Isabela, Puerto Rico.
What is Dr. Walter F. Nieves' office phone number?
The practice phone on file for Dr. Nieves is (787) 830-5784.
What is Dr. Walter F. Nieves' medical license number?
Dr. Nieves holds Puerto Rico license 12791.
Does Dr. Walter F. Nieves accept Medicare?
Yes. CMS data shows Dr. Nieves billed Medicare for 25 services in 2024, and Dr. Nieves accepts Medicare assignment.
How many Medicare patients does Dr. Walter F. Nieves see?
CMS counts 24 Medicare patients who saw Dr. Nieves in 2024, with an average age of 75.
What services does Dr. Walter F. Nieves bill to Medicare?
In 2024, Dr. Nieves' most billed Medicare services were eye exam or test (92012).
Where did Dr. Walter F. Nieves go to medical school?
Dr. Nieves graduated from University of Puerto Rico School of Medicine in 1994.
What drugs does Dr. Walter F. Nieves prescribe most?
In 2024 Medicare Part D data, Dr. Nieves' most prescribed drugs by claims were Latanoprost, Levobunolol HCl and Prednisolone Acetate.
Has Dr. Walter F. Nieves received payments from drug or device companies?
CMS Open Payments shows $135 in general payments to Dr. Nieves from 2 companies from 2016 to 2021. The largest total came from Alcon Laboratories Inc.
How long has Dr. Walter F. Nieves been practicing?
Dr. Nieves graduated from medical school in 1994, 32 years ago.
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