Lily Millen, DO
NPI 1609404607 · Child & Adolescent Psychiatry Physician · Boston, MA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Lily Millen, DO is a Child & Adolescent Psychiatry Physician provider in Boston, MA (NPI 1609404607).
Provider details
- NPI number
- 1609404607
- Entity type
- Individual
- Primary specialty
- Child & Adolescent Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Female
- Sole proprietor
- No
- License
- 1016231 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
6 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2020-03-27
- Last updated
- 2025-05-02
- Certified
- 2025-05-02
Frequently asked questions
- What is Lily Millen's NPI number?
- Lily Millen's National Provider Identifier (NPI) is 1609404607, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Lily Millen's specialty?
- Lily Millen is listed in the NPPES registry with a primary specialty of Child & Adolescent Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Lily Millen located?
- Lily Millen's practice location on file with NPPES is 300 Longwood Ave, Boston, MA 02115-5724.
- What is Lily Millen's phone number?
- The practice phone number listed in the NPPES registry for Lily Millen is (617) 355-6000.
- Does Lily Millen accept Medicare?
- Lily Millen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Lily Millen's NPI active?
- Yes — Lily Millen's NPI (1609404607) is active in the NPPES registry as of the last update on 2025-05-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.