Andrew Johnston, MD
NPI 1912404922 · Ophthalmology Physician · Knoxville, TN
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Andrew Johnston, MD is a Ophthalmology Physician provider in Knoxville, TN (NPI 1912404922).
Provider details
- NPI number
- 1912404922
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
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
83% of core fields populated
- Practice footprint15% of score
11 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,686 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 Complete Exam of Visual System92014 | 330 | $117 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 176 | $119 |
| Photography of the Retina92250 | 173 | $34 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 159 | $85 |
| Imaging of Optic Nerve92133 | 151 | $32 |
| Measurement of Corneal Curvature and Depth of Eye92136 | 149 | $24 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 388 | 118 |
| Prednisolone Acetate | 170 | 133 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 161 | 64 |
| Timolol Maleate | 100 | 29 |
| Neomycin/Polymyxin B/Dexamethabrand: Neomycin-Polymyxin-Dexameth | 95 | 71 |
| Ketorolac Tromethamine | 69 | 47 |
| Bimatoprostbrand: Lumigan | 60 | 16 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$247 across 2 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
Additional practice locations (10)
- 12744 Kingston Pike Ste 108Knoxville, TN 37934-0941Phone: (865) 584-0905
- 10841 Hardin Valley RdKnoxville, TN 37932-1410Phone: (865) 584-0905
- 1924 Alcoa Hwy # U-114Knoxville, TN 37920-1511Phone: (865) 305-6501
- 4613 Papermill DrKnoxville, TN 37909-1971Phone: (865) 584-0905
- 4829 N Broadway St Ste 103Knoxville, TN 37918-2067Phone: (865) 584-0905
- 628 Smithview DrMaryville, TN 37803-6100Phone: (865) 584-0905
- 104 Keller LnMaryville, TN 37801-6201Phone: (865) 584-0905
- 437 S Illinois AveOak Ridge, TN 37830-7510Phone: (865) 584-0905
- 962 Dolly Parton PkwySevierville, TN 37862-3707Phone: (865) 584-0905
Registry dates
- Enumerated
- 2018-04-07
- Last updated
- 2022-05-24
- Certified
- 2022-05-24
Frequently asked questions
- What is Andrew Johnston's NPI number?
- Andrew Johnston's National Provider Identifier (NPI) is 1912404922, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Andrew Johnston's specialty?
- Andrew Johnston is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Andrew Johnston located?
- Andrew Johnston's practice location on file with NPPES is 1124 E Weisgarber Rd Ste 100, Knoxville, TN 37909-2686.
- What is Andrew Johnston's phone number?
- The practice phone number listed in the NPPES registry for Andrew Johnston is (658) 584-0905.
- Does Andrew Johnston accept Medicare?
- Andrew Johnston is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Andrew Johnston's NPI active?
- Yes — Andrew Johnston's NPI (1912404922) is active in the NPPES registry as of the last update on 2022-05-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.