Wash. Admin. Code § 296-31-080
(2) All fees listed are the maximum fees allowable. Providers must bill their usual and customary fee for each service. If this is less than our fee schedule rate, you must bill us at the lesser rate. The department will pay the lesser of the billed charge or the fee schedule’s maximum allowable.
The provider is prohibited from charging the claimant for any difference between the provider's charge and our allowable amount.
(4) All bills submitted to the department must:
(a) Be itemized on forms approved by us.
For example: Physicians, psychologists, advanced registered nurse practitioners and master level mental health counselors may use our form or the current Health Insurance Claim Form (as defined by the National Uniform Claim Committee). Hospitals use the current National Uniform Billing Form (as defined by the National Uniform Billing Committee) for institution services and the current Health Insurance Claim Form (as defined by the National Uniform Claim Committee) for professional services.
(5) The following supporting documentation must be maintained and, if applicable, submitted when billing for services:
(g) The claimant’s or patient’s (if patient is other than claimant) private or public insurance information;
For example: When services provided are for survivors of homicide victims.
[Statutory Authority: RCW 51.04.020, 51.36.080, 7.68.030, 7.68.080. WSR 07-08-088, § 296-31-080, filed 4/3/07, effective 5/23/07. Statutory Authority: RCW 7.68.030, 7.68.080, 7.68.120, 51.36.010, 51.04.020 (1) and (4) and 51.04.030. WSR 99-07-004, § 296-31-080, filed 3/4/99, effective 4/4/99; WSR 97-02-090, § 296-31-080, filed 12/31/96, effective 1/31/97. Statutory Authority: RCW 7.68.030, 51.04.020(1) and 51.04.030. WSR 95-15-004, § 296-31-080, filed 7/5/95, effective 8/5/95. Statutory Authority: Chapter 7.68 RCW. WSR 94-02-015, § 296-31-080, filed 12/23/93, effective 1/24/94. Statutory Authority: RCW 43.22.050. WSR 92-23-033, § 296-31-080, filed 11/13/92, effective 12/14/92.]