Nathaniel Clark, O.D.
NPI 1144712035 · Optometrist · Indianapolis, IN
Enrolled with Medicare as Practitioner - Optometry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nathaniel Clark, O.D. is a Optometrist provider in Indianapolis, IN (NPI 1144712035).
Provider details
- NPI number
- 1144712035
- Entity type
- Individual
- Primary specialty
- OptometristEye and Vision Services Providers
- Credential
- O.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 18004088A (IN)
Specialties & taxonomies
Eye and Vision Services Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
8 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
114 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 | 61 | $84 |
| Photography of the Retina92250 | 31 | $34 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 22 | $119 |
Typical Medicare-allowed amounts for these services range $34–$119 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 37 | 11 |
| Azelastine Hcl | 28 | — |
| Fluorometholone | 25 | 18 |
| Cyclosporinebrand: Restasis | 20 | — |
| Cyclosporine | 19 | — |
| Lifitegrastbrand: Xiidra | 19 | — |
| Moxifloxacin Hclbrand: Moxifloxacin | 12 | — |
| Dorzolamide Hcl/Timolol Maleat |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$464 across 9 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
- 2018-06-05
- Last updated
- 2018-06-05
Frequently asked questions
- What is Nathaniel Clark's NPI number?
- Nathaniel Clark's National Provider Identifier (NPI) is 1144712035, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nathaniel Clark's specialty?
- Nathaniel Clark is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
- Where is Nathaniel Clark located?
- Nathaniel Clark's practice location on file with NPPES is 105 S Raceway Rd, Indianapolis, IN 46231-1414.
- What is Nathaniel Clark's phone number?
- The practice phone number listed in the NPPES registry for Nathaniel Clark is (317) 273-8474.
- Does Nathaniel Clark accept Medicare?
- Nathaniel Clark is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nathaniel Clark's NPI active?
- Yes — Nathaniel Clark's NPI (1144712035) is active in the NPPES registry as of the last update on 2018-06-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.