Mark Levi Briggs , LMHCA
Counselor β’ Issaquah, WA
Po Box 3057
Issaquah, WA 980270137
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
Practice Location & Contact Primary Location
Po Box 3057
Issaquah, WA 980270137
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Counselor: NPPES taxonomy is a reported classification, not proof of board certification.
NPI first issued
2021
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians, CMS release of October 2, 2026; Medicare.gov, βDoes your provider accept Medicare as full payment?β
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians, CMS release of October 2, 2026.
Compared with the same specialty in Issaquah and Washington
13 active clinicians are listed under Counselor with a practice address in Issaquah, WA (11,473 in Washington).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Issaquah
0% of these 13 clinicians have the CMS telehealth indicator.
0% of these 13 clinicians are listed by CMS as accepting Medicare assignment.
Sources: CMS Doctors and Clinicians, CMS release of October 2, 2026, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo Β· Report an error.
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2026-01-06NUCC Taxonomy Code: 101Y00000X
A provider who is trained and educated in the performance of behavior health services through interpersonal communications and analysis. Training and education at the specialty level usually requires a master's degree and clinical experience and supervision for licensure or certification.
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at PO BOX 3057, ISSAQUAH, WA 980270137 (Tel: 4258352503)
Registered at PO BOX 3057, ISSAQUAH, WA 980270137 (Tel: 4258352503)
Recorded as MARK BRIGGS, LMHCA
NPI status registered as active in NPPES database
Registered at 2150 FREEMAN RD E, FIFE, WA 984243776 (Tel: 2539227833)
Registered at 2701 N 16TH ST STE 316, PHOENIX, AZ 850061266 (Tel: 6025713163)
Recorded as MARK BRIGGS
Counselor (license number reported to NPPES: WA CG61099654)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Mailing Address
Po Box 3057
Issaquah, WA 980270137
Phone: 4258352503