John Dagianis, M.D.
NPI 1972508026 · Ophthalmology Physician · Nashua, NH
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Dagianis, M.D. is a Ophthalmology Physician provider in Nashua, NH (NPI 1972508026).
Provider details
- NPI number
- 1972508026
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 6192 (NH)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
21 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
3,581 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 856 | $93 |
| Established Patient Complete Exam of Visual System92014 | 542 | $129 |
| Photography of the Retina92250 | 425 | $38 |
| Established Patient Problem Focused Exam of Visual System92012 | 341 | $92 |
| Exam of Visual Field With Extended Testing92083 | 239 | $66 |
| Imaging of Optic Nerve92133 | 234 | $37 |
| Imaging of Retina |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 25 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 665 | 158 |
| Timolol Maleate | 217 | 54 |
| Dorzolamide Hcl | 178 | 49 |
| Cyclosporinebrand: Restasis | 121 | 62 |
| Bimatoprostbrand: Lumigan | 105 | 25 |
| Prednisolone Acetate | 82 | 63 |
| Brimonidine Tartrate | 77 | 23 |
| Latanoprostene Bunodbrand: Vyzulta |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,157 across 59 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-06-16
- Last updated
- 2022-08-11
- Certified
- 2022-08-11
Frequently asked questions
- What is John Dagianis's NPI number?
- John Dagianis's National Provider Identifier (NPI) is 1972508026, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Dagianis's specialty?
- John Dagianis is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is John Dagianis located?
- John Dagianis's practice location on file with NPPES is 5 Coliseum Ave, Nashua, NH 03063-3292.
- What is John Dagianis's phone number?
- The practice phone number listed in the NPPES registry for John Dagianis is (603) 882-9800.
- Does John Dagianis accept Medicare?
- John Dagianis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Dagianis's NPI active?
- Yes — John Dagianis's NPI (1972508026) is active in the NPPES registry as of the last update on 2022-08-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.