Clients described in WAC 182-535-1060 are eligible to receive the dental-related periodontic services listed in this section, subject to coverage limitations, restrictions, and client-age requirements identified for a specified service.

(1) Surgical periodontal services. The medicaid agency covers the following surgical periodontal services, including all postoperative care:

(a) Gingivectomy/gingivoplasty (does not include distal wedge procedures on erupting molars) only on a case-by-case basis and when prior authorized and only for clients age ((twenty))20 and younger; and

(b) Gingivectomy/gingivoplasty (does not include distal wedge procedures on erupting molars) for clients of the developmental disabilities administration of the department of social and health services (DSHS) according to WAC 182-535-1099.

(2) Nonsurgical periodontal services. The agency:

(a) Covers periodontal scaling and root planing for clients age ((thirteen through eighteen))13 through 18, once per quadrant per client, in a two-year period on a case-by-case basis, when prior authorized, and only when:

(i) The client has radiographic evidence of periodontal disease ((and subgingival calculus));

(ii) The client's record includes supporting documentation for the medical necessity, including complete periodontal charting done within the past ((twelve))12 months from the date of the prior authorization request and a definitive diagnosis of periodontal disease;

(iii) The client's clinical condition meets current published periodontal guidelines; and

(iv) Performed at least two years from the date of completion of periodontal scaling and root planing or surgical periodontal treatment, or at least ((twelve))12 calendar months from the completion of periodontal maintenance.

(b) Covers periodontal scaling and root planing once per quadrant per client in a two-year period for clients age ((nineteen))19 and older. Criteria in (a)(i) through (iv) of this subsection must be met.

(c) Considers ultrasonic scaling, gross scaling, or gross debridement to be included in the procedure and not a substitution for periodontal scaling and root planing.

(d) Covers periodontal scaling and root planing only when the services are not performed on the same date of service as prophylaxis, periodontal maintenance, gingivectomy, or gingivoplasty.

(e) Covers periodontal scaling and root planing for clients of the developmental disabilities administration of DSHS according to WAC 182-535-1099.

(f) Covers periodontal scaling and root planing, one time per quadrant in a ((twelve))12-month period for clients residing in an alternate living facility or nursing facility.

(3) Other periodontal services. The agency:

(a) Covers periodontal maintenance for clients age ((thirteen through eighteen))13 through 18 once per client in a ((twelve))12-month period on a case-by-case basis, when prior authorized, and only when:

(i) The client has radiographic evidence of periodontal disease;

(ii) The client's record includes supporting documentation for the medical necessity, including complete periodontal charting done within the past ((twelve))12 months with location of the gingival margin and clinical attachment loss and a definitive diagnosis of periodontal disease;

(iii) The client's clinical condition meets current published periodontal guidelines; and

(iv) The client has had periodontal scaling and root planing but not within ((twelve))12 months of the date of completion of periodontal scaling and root planing, or surgical periodontal treatment.

(b) Covers periodontal maintenance once per client in a twelve month period for clients age ((nineteen))19 and older. Criteria in (a)(i) through (iv) of this subsection must be met.

(c) Covers periodontal maintenance only if performed at least ((twelve))12 calendar months after receiving prophylaxis, periodontal scaling and root planing, gingivectomy, or gingivoplasty.

(d) Covers periodontal maintenance for clients of the developmental disabilities administration of DSHS according to WAC 182-535-1099.

(e) Covers periodontal maintenance for clients residing in an alternate living facility or nursing facility:

(i) Periodontal maintenance (four quadrants) substitutes for an eligible periodontal scaling or root planing once every six months.

(ii) Periodontal maintenance allowed six months after scaling or root planing.

(f) Covers periodontal maintenance for clients 21 and older with a diagnosis of diabetes:

(i) Periodontal maintenance allowed once every three months. Criteria in (a)(i) through (iii) of this subsection must be met.

(ii) Periodontal maintenance allowed three months after scaling or root planing.

(g) Covers full-mouth scaling in the presence of generalized moderate or severe gingival inflammation and only:

(i) For clients age ((nineteen))19 and older once in a ((twelve))12-month period after an oral evaluation; and

(ii) For clients age ((thirteen through eighteen))13 through 18 once in a ((twelve))12-month period after an oral evaluation and when prior authorized.