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DR. ERIN LAGER M.D.
NPI 1861849192
Pediatrics in Chelmsford, MA

Active since May 17, 2016PECOS Enrolled
228 BILLERICA RD, CHELMSFORD, MA 01824(978) 250-6000 Get Directions Write a Review

NPPES record last updated: June 21, 2019. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Jun 21, 2019, May 17, 2016 (2 updates tracked since 2016).

About Dr. Erin Lager M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. ERIN LAGER M.D. (NPI 1861849192) is an individual pediatrics provider in Chelmsford, Massachusetts, licensed in Rhode Island (LP03591) and active in the NPI registry since May 2016. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1861849192
Entity TypeIndividualFemale
Primary Taxonomy208000000X
Provider Legal NameDR. ERIN LAGERCredential: M.D.
Location Address228 BILLERICA RDChelmsford, MA 01824-3604
Mailing Address188 Amesbury RdKensington, NH 03833-6721 · (603) 548-3551
Phone(978) 250-6000
Sole ProprietorYes
Enumeration DateMay 17, 2016
Last NPPES UpdateJune 21, 20192 updates tracked since enumeration
✔ NPI 1861849192 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians
Taxonomy Code208000000X
License✔ Licensed in RI · LP03591
Definition
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
228 BILLERICA RD, Chelmsford, MA 01824
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Erin Lager M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Erin Lager reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Atrius Health, Inc.
Same address
Internal Medicine
228 BILLERICA RD
Chelmsford, MA 01824
  • Reassigned Medicare billing, Massachusetts enrollment
  • 1,317 clinicians in this Medicare group
NPI 1174746275 (978) 250-6000

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 01824 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$97.64 typical visit price
range $63.72 – $189.86
Typical copayment $24.41 (range $15.93 – $47.46)
Most-billed visit code 99203
Established Patient
$111.18 typical visit price
range $21.07 – $155.29
Typical copayment $27.79 (range $5.26 – $38.82)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

MS. KIT YAN LEE
Physical Therapist
228 BILLERICA RD
CHELMSFORD, MA 01824
Middlesex County (978) 250-6045
NATALIE C. HOWARD CCC-SLP
Speech-Language Pathologist
228 BILLERICA RD
CHELMSFORD, MA 01824
Middlesex County (978) 250-6040
STEVEN A MORGENSTERN M.D.
Internal Medicine
228 BILLERICA RD, INTERNAL MEDICINE
CHELMSFORD, MA 01824
Middlesex County (978) 250-6100
CHANDRA RAMANATHAN M.D.
Pediatrics
228 BILLERICA RD
CHELMSFORD, MA 01824
Middlesex County (978) 250-6000
MEGAN PINETTE PSYD
Psychologist (Clinical)
228 BILLERICA RD
CHELMSFORD, MA 01824
Middlesex County (978) 250-6240
MRS. NICHOLE MARIE PERRIN APRN, FNP-C
Nurse Practitioner (Family)
228 BILLERICA RD
CHELMSFORD, MA 01824
Middlesex County (978) 250-6100
SONIA ALMEIDA PA
Physician Assistant
228 BILLERICA RD
CHELMSFORD, MA 01824
Middlesex County (603) 488-5154
CHERYL BRACKBILL PA-C
Physician Assistant
228 BILLERICA RD
CHELMSFORD, MA 01824
Middlesex County (978) 250-6200

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 Erin Lager's NPI number?

The NPI number for Erin Lager is 1861849192. It was assigned to this individual provider in the NPPES registry on May 17, 2016.

Where is Erin Lager located?

Erin Lager practices at 228 Billerica Rd, Chelmsford, MA 01824. The listed phone number is (978) 250-6000.

What is Erin Lager's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Is Erin Lager enrolled in Medicare?

Yes. Erin Lager is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Erin Lager's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Erin Lager reassigns Medicare benefits to Atrius Health, Inc. (Chelmsford, 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 Erin Lager's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Erin Lager accept?

Health plans from Anthem Blue Cross and Blue Shield list Erin Lager as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Erin Lager was last updated on June 21, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.