Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dianna Grantham, PC

Organization Mental Health Counselor · NPI 1659210714

Dianna Grantham, PC is a Mental Health Counselor in Billings, Montana. Registered with an NPI since 2026.

In the registry since
2026
What do these letters mean?
PC — Professional corporation
A form of business registration, not a clinical qualification.

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Practice location Address checks out

501 S 44th St W Apt 1325
Billings, MT 59106-3916
Phone: (406) 927-6119
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Mental Health Counselor (primary) Taxonomy 101YM0800X

Record details

NPI number1659210714
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Dianna Grantham — Provider · (406) 927-6119
NPI enumeratedMarch 25, 2026
Last updated in NPPESMarch 25, 2026
Certification dateMarch 25, 2026
Mailing addressPo Box 30864, Billings, MT 59107-0864

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