John Allen, M.D.
NPI 1821084096 · Ophthalmology Physician · Columbus, OH
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Allen, M.D. is a Ophthalmology Physician provider in Columbus, OH (NPI 1821084096).
Provider details
- NPI number
- 1821084096
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 35056570 (OH)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
961 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 394 | $126 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 150 | $89 |
| Exam of Visual Field With Extended Testing92083 | 85 | $59 |
| Imaging of Optic Nerve92133 | 85 | $33 |
| Imaging of Retina92134 | 76 | $39 |
| Ultrasound Scan to Determine Eye Length and Lens Power76519 | 69 | $31 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 5 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ketorolac Tromethamine | 87 | 47 |
| Latanoprost | 69 | 24 |
| Prednisolone Acetate | 60 | 47 |
| Tobramycin/Dexamethasonebrand: Tobramycin-Dexamethasone | 58 | 43 |
| Timolol Maleate | 16 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-09-23
- Last updated
- 2016-01-27
Frequently asked questions
- What is John Allen's NPI number?
- John Allen's National Provider Identifier (NPI) is 1821084096, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Allen's specialty?
- John Allen is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is John Allen located?
- John Allen's practice location on file with NPPES is 3794 Olentangy River Rd., Columbus, OH 43214-3455.
- What is John Allen's phone number?
- The practice phone number listed in the NPPES registry for John Allen is (614) 267-4122.
- Does John Allen accept Medicare?
- John Allen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Allen's NPI active?
- Yes — John Allen's NPI (1821084096) is active in the NPPES registry as of the last update on 2016-01-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.