Hi Guest!

D4341 - periodontal scaling and root planing - four or more teeth per quadrant
D4342 - periodontal scaling and root planing - one to three teeth per quadrant
D4910 - periodontal maintenance

Yes correct, the codes listed above do not have a direct crosscode we are aware of, so you can either bill the "D" code on the medical claim (many insurers these days will process "D" codes when they are medically necessary services), or you can use the CPT code below and include a narrative report describing the procedure:
41899 - Unlisted procedure, dentoalveolar structures

As for the diagnosis code(s), that will depends on the patient & their condition (basically, why are the services being performed/suggested?).

For example, for the above services, you may end up using one or more of the codes below:

- K04.4 - Acute apical periodontitis of pulpal origin
- K04.5 - Chronic apical periodontitis
- K04.9 - Other and unspecified diseases of pulp and periapical tissues
- K04.90 - Unspecified diseases of pulp and periapical tissues
- K04.99 - Other diseases of pulp and periapical tissues
- K05.311 - Chronic periodontitis, localized, slight
- K05.312 - Chronic periodontitis, localized, moderate
- K05.313 - Chronic periodontitis, localized, severe
- K05.319 - Chronic periodontitis, localized, unspecified severity
- K05.321 - Chronic periodontitis, generalized, slight
- K05.322 - Chronic periodontitis, generalized, moderate
- K05.323 - Chronic periodontitis, generalized, severe
- K05.329 - Chronic periodontitis, generalized, unspecified severity
- K05.10 - Chronic gingivitis, plaque induced
- K05.11 - Chronic gingivitis, non-plaque induced


Hope this helps!