One Step Diagnostic Address Street:11770 FM 1960 West City: Houston State: Texas Zip Code:77065 Contact Phone: 832-662-0578 Fax: 281-894-6056 Website: www.onestepdiagnostic.com Map & Directions 11770 FM 1960 West Get Help!If you have been injured, please complete this form to have an office contact you. Notice: JavaScript is required for this content.