About Us


Founded by Zobi Nieto-Handerhan and PJ Handerhan in 2006, Diagonal Medical Billing provides superior medical billing and practice management services, born out of decades of medical office and business management.

Diagonal Medical Billing specializes in high quality, precise claims processing and management. As a specialized, locally owned company, we offer personalized, flexible service, treating your practice as though it were our only practice. Through many years of practice management, we understand that every dollar is important to the success of your practice; we diligently pursue every insurance denial, unpaid claim, and outstanding patient balance regardless of the amount.

We have the most current, state-of-the-art billing software, as well as an internal HIPAA-compliant IT department, ensuring both data security and proactive system support.

Diagonal Medical Billing

Longmont, CO 80501

Phone: 303.772.3622
Fax: 303.485.6008