ERYN T JOHNSTONE PNP
NPI 1356921027
Nurse Practitioner - Pediatrics in Boston, MA
About Eryn T Johnstone Pnp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ERYN T JOHNSTONE PNP (NPI 1356921027) is an individual pediatrics provider in Boston, Massachusetts, licensed in Massachusetts (RN2340875) and active in the NPI registry since April 2021. She is enrolled in Medicare PECOS and maintains a secondary practice location in Philadelphia.
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)
Eryn T Johnstone Pnp is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Eryn Johnstone 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
- 220 clinicians in this Medicare group
Philadelphia, PA 19104
- Reassigned Medicare billing, Pennsylvania enrollment
- 1,225 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02115 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.
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 Eryn Johnstone's NPI number?
The NPI number for Eryn Johnstone is 1356921027. It was assigned to this individual provider in the NPPES registry on April 8, 2021.
Where is Eryn Johnstone located?
Eryn Johnstone practices at 300 Longwood Ave, Boston, MA 02115. The listed phone number is (617) 355-6000.
What is Eryn Johnstone's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Pediatrics, with taxonomy code 363LP0200X.
Is Eryn Johnstone enrolled in Medicare?
Yes. Eryn Johnstone is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Eryn Johnstone's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Eryn Johnstone reassigns Medicare benefits to 2 organizations: Boston Childrens Heart Foundation Inc (Boston, MA) and Childrens Health Care Associates, Inc (Philadelphia, PA). 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 Eryn Johnstone'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 Eryn Johnstone was last updated on August 11, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Eryn T Johnstone, PNP · NPI 1356921027
Pediatrics physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since April 8, 2021.
## Identity
- **NPI:** 1356921027 (Entity type: Individual)
- **Enumerated:** April 8, 2021
- **Primary specialty:** Nurse Practitioner - Pediatrics · taxonomy 363LP0200X
- **State license:** RN2340875 (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): Boston Childrens Heart Foundation Inc (NPI 1982680922, Boston, MA); Childrens Health Care Associates, Inc (NPI 1033204086, Philadelphia, PA) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** August 11, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1356921027) · Data from the CMS NPPES public registry.