K05.321 — Chronic periodontitis, generalized, slight
Is K05.321 billable?
Yes — K05.321 is billable for FY2027. K05.321 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. K05.321 may be submitted for encounters from October 1, 2026 through September 30, 2027.
K05.321 at a glance
| Code | K05.321 |
|---|---|
| Description | Chronic periodontitis, generalized, slight |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does K05.321 group to?
K05.321 sits in MDC Pre and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 011Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with MCCsurgical
- 012Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with CCsurgical
- 013Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy without CC/MCCsurgical
How is K05.321 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to K05.321. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Periodontitis › generalized › slight (chronic) (complex) (compound) (local) (simplex)
Excludes1 — never code together — inherited from K05.3
The conditions below can never be reported together with K05.321 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- chronic apical periodontitis (K04.5)
Use additional code — inherited from K05
Report an additional code alongside K05.321 to fully describe the condition. K05.321 is sequenced first.
- code to identify:
- alcohol abuse and dependence (F10.-)
- exposure to environmental tobacco smoke (Z77.22)
- exposure to tobacco smoke in the perinatal period (P96.81)
- history of tobacco dependence (Z87.891)
- occupational exposure to environmental tobacco smoke (Z57.31)
- tobacco dependence (F17.-)
- tobacco use (Z72.0)
Excludes2 — not included here — inherited from Chapter 11
The conditions below are not part of K05.321, but a patient may have both at the same time. When documentation supports it, K05.321 and the excluded code may both be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
How long has K05.321 existed?
K05.321 first appears in FY2018 (FY2017 is not available, so it may have appeared then).
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.