Mark Ossi, OD
NPI 1245883297 · Optometrist · Leesburg, FL
Enrolled with Medicare as Practitioner - Optometry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Ossi, OD is a Optometrist provider in Leesburg, FL (NPI 1245883297).
Provider details
- NPI number
- 1245883297
- Entity type
- Individual
- Primary specialty
- OptometristEye and Vision Services Providers
- Credential
- OD
- Sex
- Male
- Sole proprietor
- No
- License
- OPC5696 (FL)
Specialties & taxonomies
Eye and Vision Services Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
6 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 5 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 117 | 26 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 34 | — |
| Timolol Maleate | 30 | — |
| Brimonidine Tartrate | 24 | — |
| Dorzolamide Hcl | 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
Additional practice locations (1)
- 100 Marketside Ave Ste 305Ponte Vedra, FL 32081-0582Phone: (904) 825-4525Fax: (904) 825-4520
Registry dates
- Enumerated
- 2019-07-18
- Last updated
- 2023-11-27
- Certified
- 2020-08-24
Frequently asked questions
- What is Mark Ossi's NPI number?
- Mark Ossi's National Provider Identifier (NPI) is 1245883297, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Ossi's specialty?
- Mark Ossi is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
- Where is Mark Ossi located?
- Mark Ossi's practice location on file with NPPES is 225 N 1st St, Leesburg, FL 34748-5150.
- What is Mark Ossi's phone number?
- The practice phone number listed in the NPPES registry for Mark Ossi is (407) 905-8827.
- Does Mark Ossi accept Medicare?
- Mark Ossi is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Ossi's NPI active?
- Yes — Mark Ossi's NPI (1245883297) is active in the NPPES registry as of the last update on 2023-11-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.