LOUIS CHANG MD
NPI 1235265364
Neurological Surgery in Bethesda, MD
About Louis Chang Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
LOUIS CHANG MD (NPI 1235265364) is an individual neurological surgery provider in Bethesda, Maryland, licensed in Maryland (D74936) and active in the NPI registry since February 2007. He is enrolled in Medicare PECOS, is affiliated with Johns Hopkins Hospital, The, and maintains a secondary practice location in Brooklyn.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Louis Chang Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
4Medicare enrollment records show Louis Chang reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Bethesda, MD 20814
- Reassigned Medicare billing, District of Columbia enrollment
- 15 clinicians in this Medicare group
Bethesda, MD 20814
- Reassigned Medicare billing, Maryland enrollment
- 4,483 clinicians in this Medicare group
Brooklyn, NY 11215
- Reassigned Medicare billing, New York enrollment
- 1,029 clinicians in this Medicare group
Brooklyn, NY 11201
- Reassigned Medicare billing, New York enrollment
- 980 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 14
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Johns Hopkins Hospital, The
Acute Care Hospitals · Baltimore, MDSuburban Hospital
Acute Care Hospitals · Bethesda, MDJohns Hopkins Bayview Medical Center
Acute Care Hospitals · Baltimore, MDHoly Cross Germantown Hospital
Acute Care Hospitals · Germantown, MDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 20817 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BETHESDA, MD 20817
BETHESDA, MD 20817
BETHESDA, MD 20817
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Louis Chang's NPI number?
The NPI number for Louis Chang is 1235265364. It was assigned to this individual provider in the NPPES registry on February 25, 2007.
Where is Louis Chang located?
Louis Chang practices at 10215 Fernwood Rd, Bethesda, MD 20817. The listed phone number is (301) 897-8850.
What is Louis Chang's specialty?
The primary specialty registered for this NPI is Neurological Surgery with taxonomy code 207T00000X.
Is Louis Chang enrolled in Medicare?
Yes. Louis Chang is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Louis Chang's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Louis Chang reassigns Medicare benefits to 4 organizations: Johns Hopkins University (Bethesda, MD), Johns Hopkins University (Bethesda, MD), Kings Physician Services, PC (Brooklyn, NY) and Weill Medical College Of Cornell (Brooklyn, NY). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Louis Chang's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Louis Chang affiliated with any hospitals?
According to CMS data, Louis Chang is affiliated with Johns Hopkins Hospital, The, Suburban Hospital, Johns Hopkins Bayview Medical Center and Holy Cross Germantown Hospital.
When was this NPI record last updated?
The NPPES record for Louis Chang was last updated on June 8, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Louis Chang, MD · NPI 1235265364
Neurological Surgery physician in Bethesda, Maryland. Individual provider, active in the CMS NPPES registry since February 25, 2007.
## Identity
- **NPI:** 1235265364 (Entity type: Individual)
- **Enumerated:** February 25, 2007
- **Primary specialty:** Neurological Surgery · taxonomy 207T00000X
- **State license:** D74936 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 10215 FERNWOOD RD, Bethesda, MD 20817-1106
- **Phone:** (301) 897-8850
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Johns Hopkins University (NPI 1578569240, Bethesda, MD); Johns Hopkins University (NPI 1578569240, Bethesda, MD); Kings Physician Services, PC (NPI 1326698879, Brooklyn, NY); Weill Medical College Of Cornell (NPI 1619364957, Brooklyn, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** State University Of New York Downstate Medical Center, class of 2004
## Record status
- **NPPES last updated:** June 8, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1235265364) · Data from the CMS NPPES public registry.