DR. DAVID M MILLS MD
NPI 1194145946
Pediatrics - Pediatric Emergency Medicine in Boston, MA
About Dr. David M Mills Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. DAVID M MILLS MD (NPI 1194145946) is an individual pediatric emergency medicine provider in Boston, Massachusetts, licensed in Massachusetts (274166) and active in the NPI registry since April 2014. He is enrolled in Medicare PECOS and maintains a secondary practice location in San Diego.
NPPES Registry Identity
Specialties & Licenses 3
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)
Dr. David M Mills Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show David Mills reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02115
- Reassigned Medicare billing, Massachusetts enrollment
- 1,358 clinicians in this Medicare group
San Diego, CA 92123
- Reassigned Medicare billing, California enrollment
- 562 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.
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.
BOSTON, MA 02115
BOSTON, MA 02115
BOSTON, MA 02115
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 David Mills's NPI number?
The NPI number for David Mills is 1194145946. It was assigned to this individual provider in the NPPES registry on April 21, 2014.
Where is David Mills located?
David Mills practices at 300 Longwood Ave, Boston, MA 02115. The listed phone number is (617) 355-6000.
What is David Mills's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Emergency Medicine, with taxonomy code 2080P0204X.
Is David Mills enrolled in Medicare?
Yes. David Mills is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for David Mills's services?
According to the CMS Revalidation Reassignment List (October 2026 release), David Mills reassigns Medicare benefits to 2 organizations: Children's Hospital Pediatric Associates, Inc (Boston, MA) and Rady Children's Hospital San Diego (San Diego, CA). 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 David Mills's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for David Mills was last updated on January 28, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 months 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. David M Mills, MD · NPI 1194145946
Pediatric Emergency Medicine physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since April 21, 2014.
## Identity
- **NPI:** 1194145946 (Entity type: Individual)
- **Enumerated:** April 21, 2014
- **Primary specialty:** Pediatrics - Pediatric Emergency Medicine · taxonomy 2080P0204X
- **State license:** 274166 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 LONGWOOD AVE, Boston, MA 02115-5724
- **Phone:** (617) 355-6000
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Children's Hospital Pediatric Associates, Inc (NPI 1457306664, Boston, MA); Rady Children's Hospital San Diego (NPI 1669617197, San Diego, CA) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** January 28, 2026
---
Source: [NPI Profile](https://npiprofile.com/npi/1194145946) · Data from the CMS NPPES public registry.