Louis Chang, MD
NPI 1235265364 · Neurological Surgery Physician · Bethesda, MD
Enrolled with Medicare as Practitioner - Neurosurgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Louis Chang, MD is a Neurological Surgery Physician provider in Bethesda, MD (NPI 1235265364).
Provider details
- NPI number
- 1235265364
- Entity type
- Individual
- Primary specialty
- Neurological Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 301195 (NY)
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
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
642 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) |
|---|---|---|
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 116 | $184 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 95 | $53 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 79 | $199 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 77 | $84 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 74 | $141 |
| Emergency Department Visit for Problem That May Not Require Health Care Professional |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$533 across 1 record (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 (1)
- 506 6th StBrooklyn, NY 11215-3609Phone: (718) 780-3209
Registry dates
- Enumerated
- 2007-02-25
- Last updated
- 2022-06-08
- Certified
- 2022-06-08
Frequently asked questions
- What is Louis Chang's NPI number?
- Louis Chang's National Provider Identifier (NPI) is 1235265364, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Louis Chang's specialty?
- Louis Chang is listed in the NPPES registry with a primary specialty of Neurological Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Louis Chang located?
- Louis Chang's practice location on file with NPPES is 10215 Fernwood Rd, Bethesda, MD 20817-1106.
- What is Louis Chang's phone number?
- The practice phone number listed in the NPPES registry for Louis Chang is (301) 897-8850.
- Does Louis Chang accept Medicare?
- Louis Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Louis Chang's NPI active?
- Yes — Louis Chang's NPI (1235265364) is active in the NPPES registry as of the last update on 2022-06-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.