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

MARK G. LEIFESTE M.D.
NPI 1033156427
Specialist in Boulder, CO

Q: What is Mark Leifeste's NPI number?

The NPI number for Mark Leifeste is 1033156427. It was assigned to this individual provider in the NPPES registry on June 2, 2006.

Q: What is Mark Leifeste's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

Q: Is Mark Leifeste enrolled in Medicare?

No. Mark Leifeste has opted out of Medicare through April 8, 2028. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

Q: When was this NPI record last updated?

The NPPES record for Mark Leifeste 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 40 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.

Active since June 02, 2006Opted out of Medicare · through Apr 8, 2028

4770 BASELINE RD, SUITE #300, BOULDER, CO 80303(303) 449-6577(303) 447-1880 Get Directions Write a Review

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

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About Mark G. Leifeste M.d. NPPES

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

MARK G. LEIFESTE M.D. (NPI 1033156427) is an individual specialist in Boulder, Colorado, licensed in Colorado (23486) and active in the NPI registry since June 2006. He has opted out of Medicare through April 8, 2028 and remains eligible to order and refer.

NPPES Registry Identity

NPI1033156427

Entity TypeIndividualMale

Primary Taxonomy174400000X

Provider Legal NameMARK G. LEIFESTECredential: M.D.

Location Address4770 BASELINE RD, SUITE #300Boulder, CO 80303-2666

Mailing AddressPo Box 2086Fort Collins, CO 80522-2086 · (303) 444-3443 · Fax (970) 221-3730

Phone(303) 449-6577

Fax(303) 447-1880

Sole ProprietorNo

Enumeration DateJune 2, 2006

Last NPPES UpdateJuly 13, 2026

✔ NPI 1033156427 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySpecialistOther Service Providers

Taxonomy Code174400000X

License✔ Licensed in CO · 23486

Definition

An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.

4770 BASELINE RD, Boulder, CO 80303

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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Mark G. Leifeste M.d. has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from April 8, 2016 through April 8, 2028.

Opt-Out Effective DateApril 8, 2016

Opt-Out In Effect ThroughApril 8, 2028Opt-out affidavits renew automatically every two years unless cancelled

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Other Providers at the Same Location NPPES 9

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. KAREN ANN MCCARTHY PH.D.

Psychologist

4770 BASELINE RD, SUITE 300
BOULDER, CO 80303

Boulder County (303) 440-9982

EVE KILMER PHD

Psychologist

4770 BASELINE RD, SUITE 315
BOULDER, CO 80303

Boulder County (303) 995-9922

COLORADO MEDICAL PSYCHIATRY, LLC

Specialist

4770 BASELINE RD, SUITE 310
BOULDER, CO 80303

Boulder County (720) 304-0083

DOLORES MUZER

Counselor (Professional)

4770 BASELINE RD
BOULDER, CO 80303

Boulder County (720) 893-0842

LISA MORRISON ARNP

Nurse Practitioner (Psychiatric/Mental Health)

4770 BASELINE RD, SUITE 310
BOULDER, CO 80303

Boulder County (720) 304-0462

JOHN MONTOYA DDS PC

Dentist

4770 BASELINE RD, SUITE 310
BOULDER, CO 80303

Boulder County (303) 443-1895

KARIN CHANDLER JOHNSON LPC

Counselor (Mental Health)

4770 BASELINE RD, STE 310
BOULDER, CO 80303

Boulder County (303) 902-6320

JOHN MORRIS MD

Psychiatry & Neurology (Psychiatry)

4770 BASELINE RD, SUITE 310
BOULDER, CO 80303

Boulder County (720) 304-0083

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 Mark Leifeste's NPI number?

The NPI number for Mark Leifeste is 1033156427. It was assigned to this individual provider in the NPPES registry on June 2, 2006.

Where is Mark Leifeste located?

Mark Leifeste practices at 4770 Baseline Rd Suite #300, Boulder, CO 80303. The listed phone number is (303) 449-6577.

What is Mark Leifeste's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

Is Mark Leifeste enrolled in Medicare?

No. Mark Leifeste has opted out of Medicare through April 8, 2028. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

When was this NPI record last updated?

The NPPES record for Mark Leifeste 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 40 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.