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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

PETER J SIEKMEIER M.D.
NPI 1477590156
Psychiatry & Neurology - Psychiatry in Belmont, MA

Active since June 01, 2006PECOS Enrolled
115 MILL STREET #310A, MCLEAN HOSPITAL, BELMONT, MA 02478(617) 855-3588 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Peter J Siekmeier M.d. NPPES

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

PETER J SIEKMEIER M.D. (NPI 1477590156) is an individual psychiatry provider in Belmont, Massachusetts, licensed in Massachusetts (158642) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1477590156
Entity TypeIndividualMale
Primary Taxonomy2084P0800X
Provider Legal NamePETER J SIEKMEIERCredential: M.D.
Location Address115 MILL STREET #310A, MCLEAN HOSPITALBelmont, MA 02478
Mailing Address115 Mill Street #310a, Mclean HospitalBelmont, MA 02478 · (617) 855-3588
Phone(617) 855-3588
Sole ProprietorNo
Enumeration DateJune 1, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1477590156 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0800X
License✔ Licensed in MA · 158642
Definition
A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Peter J Siekmeier 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.

Areas of Expertise CMS Part B claims

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
156 services46 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02478 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
$189.86 typical visit price
range $63.72 – $189.86
Typical copayment $47.46 (range $15.93 – $47.46)
Most-billed visit code 99205
Established Patient
$78.84 typical visit price
range $21.07 – $155.29
Typical copayment $19.71 (range $5.26 – $38.82)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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 Peter Siekmeier's NPI number?

The NPI number for Peter Siekmeier is 1477590156. It was assigned to this individual provider in the NPPES registry on June 1, 2006.

Where is Peter Siekmeier located?

Peter Siekmeier practices at 115 Mill Street #310a Mclean Hospital, Belmont, MA 02478. The listed phone number is (617) 855-3588.

What is Peter Siekmeier's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Is Peter Siekmeier enrolled in Medicare?

Yes. Peter Siekmeier is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Peter Siekmeier was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 38 days 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.