John Ling, M.D.
NPI 1023436391 · Ophthalmology Physician · Lakewood, CA
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Ling, M.D. is a Ophthalmology Physician provider in Lakewood, CA (NPI 1023436391).
Provider details
- NPI number
- 1023436391
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A155679 (CA)
Specialties & taxonomies
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
12 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
1,522 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 Problem Focused Exam of Visual System92012 | 449 | $100 |
| Photography of the Retina92250 | 266 | $41 |
| Established Patient Complete Exam of Visual System92014 | 185 | $141 |
| Exam of Visual Field With Extended Testing92083 | 133 | $72 |
| Imaging of Optic Nerve92133 | 119 | $38 |
| New Patient Complete Exam of Visual System92004 | 84 | $167 |
| Measurement of Corneal Curvature and Depth of Eye |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 33 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 1,340 | 449 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 754 | 245 |
| Prednisolone Acetate | 395 | 244 |
| Brimonidine Tartrate | 361 | 129 |
| Timolol Maleate | 300 | 115 |
| Ofloxacin | 250 | 203 |
| Ketorolac Tromethamine | 216 | 176 |
| Dorzolamide Hcl | 132 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$493 across 13 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
- 2014-04-02
- Last updated
- 2020-04-17
- Certified
- 2020-04-17
Frequently asked questions
- What is John Ling's NPI number?
- John Ling's National Provider Identifier (NPI) is 1023436391, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Ling's specialty?
- John Ling is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is John Ling located?
- John Ling's practice location on file with NPPES is 3300 E South St Ste 105, Lakewood, CA 90805-4579.
- What is John Ling's phone number?
- The practice phone number listed in the NPPES registry for John Ling is (562) 531-2020.
- Does John Ling accept Medicare?
- John Ling is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Ling's NPI active?
- Yes — John Ling's NPI (1023436391) is active in the NPPES registry as of the last update on 2020-04-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.