DR. JOHN F WARREN (MD) – Ophthalmology Physician, NPI 1386634400
Ophthalmology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
801 OPHTHALMOLOGY in MA
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Provider Addresses for DR. JOHN F WARREN (MD)
33, Riddell Street, Greenfield, Franklin County, Massachusetts, 01301, United States
GREENFIELD, MA 01301
Phone: (413) 774-7016
Fax: (413) 773-7596
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 41 Open Payments records for all available years, with a total value of $1,912.
Total Amount is formed as General ($1,912) + Research ($0) + Ownership ($0) = $1,912.
Last reported payment date: 2024-11-12 • Largest payer in this snapshot: Harrow Eye, LLC ($714).
Total Amount
$1,912
General + Research + Ownership
Payments
41
Total payment records
General Amount
$1,912
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-11-12
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Harrow Eye, LLC | $714 |
| Glaukos Corporation | $228 |
| Mallinckrodt Hospital Products Inc. | $220 |
| ABBVIE INC. | $168 |
| Alcon Vision LLC | $149 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2005-02-23
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20050223000612 | I | Ophthalmology | MA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 92136 | Measurement of corneal curvature and depth of eye | 1,097 | 375 | $0 |
| 66984 | Removal of cataract with insertion of prosthetic lens | 597 | 336 | $0 |
| 92014 | Established patient complete exam of visual system | 500 | 473 | $0 |
| 92134 | Imaging of retina | 467 | 448 | $0 |
| 99204 | New patient office or other outpatient visit, 45-59 minutes | 257 | 257 | $0 |
Insurance plans in this area (ZIP 01301)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| OPHTHALMOLOGY | MA | 92012 | Eye and medical examination for diagnosis and treatment, established patient | 640 | 471 |
| OPHTHALMOLOGY | MA | 92083 | Measurement of field of vision during daylight conditions | 206 | 201 |
| OPHTHALMOLOGY | MA | 92134 | Diagnostic imaging of retina | 151 | 130 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| O P T O M E T R Y | MA | |
| O P T O M E T R Y | MA | |
| O P H T H A L M O L O G Y | CT | |
| O P T O M E T R Y | MA | |
| O P H T H A L M O L O G Y | MA | |
| O P H T H A L M O L O G Y | MA | |
| O P T O M E T R Y | MA | |
| O P H T H A L M O L O G Y | NY | |
| O P T O M E T R Y | MA | |
| O P H T H A L M O L O G Y | MA |
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