Billing Code Overview

CDT code D4910 denotes periodontal maintenance procedures, a category of dental services focused on ongoing care following active periodontal therapy. These procedures aim to control periodontal disease, maintain oral health gains achieved through prior treatment, and prevent disease recurrence.

Service Type: Dentistry

Typical Site of Service: Dental Office (POS 11)

Clinical Context

A 56-year-old patient with a history of chronic periodontitis (K05.5) presents to a dental office (POS 11) for routine periodontal maintenance following previous active periodontal therapy. The patient undergoes a periodontal maintenance appointment that includes evaluation, removal of supragingival and subgingival plaque and calculus as indicated, and reinforcement of oral hygiene instructions. The workflow includes check-in, review of periodontal charting and previous treatment history, local anesthesia if needed, periodontal instrumentation and polishing, documentation of findings and any changes in pocket depths or bleeding on probing, and scheduling of the next maintenance interval.

Coding Specifications

• Common Modifiers:

• D — Dental Procedure: Used to indicate that the service is a dental procedure in claims when a dental-specific modifier is required.

• 52 — Reduced Services: Used when the periodontal maintenance procedure is partially reduced or eliminated at the physician’s or dentist’s discretion; report when a substantive portion of the service is not performed.

• Associated Provider Taxonomies:

• 1223P0300X — Periodontics Dentist: Specialist focused on the prevention, diagnosis, and treatment of periodontal disease and placement of dental implants.

• 1223G0001X — General Practice Dentist: General dentistry provider delivering routine dental care, including periodontal maintenance for stable periodontal patients.

• 1223E0200X — Endodontics Dentist: Specialist in root canal therapy; may be listed when endodontic considerations or coordination of care are present during periodontal follow-up.

Related Diagnoses

• K05.6 — Periodontal disease, unspecified

  • Clinical relevance: Indicates presence of periodontal disease that may require ongoing periodontal maintenance to control inflammation and prevent progression.

• K05.5 — Chronic periodontitis

  • Clinical relevance: Common indication for periodic periodontal maintenance following active periodontal therapy to monitor and manage chronic inflammatory changes and pocket depths.

• K05.4 — Aggressive periodontitis

  • Clinical relevance: Patients with a history of aggressive periodontitis often require frequent periodontal maintenance visits to manage rapid attachment loss and reinfection risk.

• K05.3 — Acute periodontitis

  • Clinical relevance: Acute flares may require treatment stabilization before routine periodontal maintenance is appropriate; maintenance addresses ongoing periodontal health once acute issues are resolved.

• K05.2 — Periodontitis, unspecified

  • Clinical relevance: General periodontitis diagnosis that may be managed with regular periodontal maintenance to prevent disease progression.

Related Codes

• D4920 — Unscheduled dressing change (by someone other than treating dentist or their staff)

  • Relationship: An unscheduled dressing change may occur in the post-operative management of periodontal surgical sites; it is not a routine maintenance procedure and is used when a dressing placed after surgery requires change.

  • Usage: Used as an adjunct service in the post-surgical period; not typically reported on the same visit as routine periodontal maintenance unless clinically indicated.

• D4921 — Gingival irrigation with a medicinal agent – per quadrant

  • Relationship: Gingival irrigation is a focused adjunctive procedure used to deliver a medicinal agent to the gingival crevice; it can be performed in patients who require additional antimicrobial therapy alongside mechanical maintenance.

  • Usage: May be billed in addition to periodontal maintenance when irrigation is performed; can be used as an adjunct or alternative depending on clinical need.

National mean allowed rates for CDT code D4910 place Medicare below commercial averages, with BUCA (the commercial average) at $72.27 and Medicare at $0.00 in the input. UnitedHealthcare and Blue Cross Blue Shield report the highest mean rates among commercial payers at $101.27 and $97.80, respectively, while Aetna and Cigna Health are lower at $52.61 and $55.40.

Rate dispersion (P75 minus P25) varies across payers: Blue Cross Blue Shield shows a wide dispersion of $37.40, UnitedHealthcare is relatively wide at $25.17, BUCA has a dispersion of $41.75, Aetna is moderate at $21.00, and Cigna Health is the tightest at $21.00. The table and chart below present the full breakdown of mean rates and percentile values.