Jonathan Chang, M.D.
NPI 1346403961 · Ophthalmology Physician · Middleton, WI
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jonathan Chang, M.D. is a Ophthalmology Physician provider in Middleton, WI (NPI 1346403961).
Provider details
- NPI number
- 1346403961
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 275254 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
17 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
3,231 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) |
|---|---|---|
| Imaging of Retina92134 | 1,128 | $29 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 842 | $71 |
| Injection of Drug Into Eye67028 | 589 | $105 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 387 | $16 |
| Extended Exam of the Back Part of the Eye With Retinal Drawing92201 | 159 | $22 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 |
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 |
|---|---|---|
| Prednisolone Acetate | 84 | 53 |
| Polymyxin B Sulf/Trimethoprimbrand: Polymyxin B Sul-Trimethoprim | 33 | 31 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 23 | 14 |
| Latanoprost | 20 | — |
| Ketorolac Tromethamine | 14 | — |
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
- 2008-07-03
- Last updated
- 2021-02-01
- Certified
- 2021-02-01
Frequently asked questions
- What is Jonathan Chang's NPI number?
- Jonathan Chang's National Provider Identifier (NPI) is 1346403961, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jonathan Chang's specialty?
- Jonathan Chang is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Jonathan Chang located?
- Jonathan Chang's practice location on file with NPPES is 2349 Deming Way, Middleton, WI 53562-5530.
- What is Jonathan Chang's phone number?
- The practice phone number listed in the NPPES registry for Jonathan Chang is (608) 824-3937.
- Does Jonathan Chang accept Medicare?
- Jonathan Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jonathan Chang's NPI active?
- Yes — Jonathan Chang's NPI (1346403961) is active in the NPPES registry as of the last update on 2021-02-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.