DR. JOHN V. CHANG D.O.
NPI 1679557326
Emergency Medicine in Lawrence, MA
About Dr. John V. Chang D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOHN V. CHANG D.O. (NPI 1679557326) is an individual emergency medicine provider in Lawrence, Massachusetts, licensed in Massachusetts (56184) and active in the NPI registry since December 2005. He is enrolled in Medicare PECOS, is affiliated with Lawrence General Hospital, and is a graduate of University Of New England, College Of Osteo Medicine (1984).
NPPES Registry Identity
Specialties & Licenses 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. John V. Chang D.o. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show John Chang reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Lawrence, MA 01841
- Reassigned Medicare billing, Massachusetts enrollment
- 143 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Lawrence General Hospital
Acute Care Hospitals · Lawrence, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 01841 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
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 John Chang's NPI number?
The NPI number for John Chang is 1679557326. It was assigned to this individual provider in the NPPES registry on December 5, 2005.
Where is John Chang located?
John Chang practices at 34 Haverhill St, Lawrence, MA 01841. The listed phone number is (978) 686-0090.
What is John Chang's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is John Chang enrolled in Medicare?
Yes. John Chang is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for John Chang's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Chang reassigns Medicare benefits to Greater Lawrence Family Health Center, Inc. (Lawrence, MA). The 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 John Chang's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is John Chang affiliated with any hospitals?
According to CMS data, John Chang is affiliated with Lawrence General Hospital.
When was this NPI record last updated?
The NPPES record for John Chang was last updated on September 25, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# Dr. John V. Chang, D.O. · NPI 1679557326
Emergency Medicine physician in Lawrence, Massachusetts. Individual provider, active in the CMS NPPES registry since December 5, 2005.
## Identity
- **NPI:** 1679557326 (Entity type: Individual)
- **Enumerated:** December 5, 2005
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 56184 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 34 HAVERHILL ST, Lawrence, MA 01841-2884
- **Phone:** (978) 686-0090 · **Fax:** (978) 681-5963
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Greater Lawrence Family Health Center, Inc. (NPI 1699774646, Lawrence, MA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of New England, College Of Osteo Medicine, class of 1984
## Record status
- **NPPES last updated:** September 25, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1679557326) · Data from the CMS NPPES public registry.