K61.1 — Rectal abscess
Is K61.1 billable?
Yes — K61.1 is billable for FY2027. K61.1 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. K61.1 may be submitted for encounters from October 1, 2026 through September 30, 2027.
K61.1 at a glance
| Code | K61.1 |
|---|---|
| Description | Rectal abscess |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does K61.1 group to?
K61.1 sits in MDC 06 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.
- 393Other Digestive System Diagnoses with MCCmedical
- 394Other Digestive System Diagnoses with CCmedical
- 395Other Digestive System Diagnoses without CC/MCCmedical
As a secondary diagnosis, K61.1 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is K61.1 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to K61.1. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Abscess › pararectal (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
- Abscess › perirectal (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
- Abscess › rectum (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
- Cellulitis › perirectal (diffuse) (phlegmonous) (septic) (suppurative)
- Cellulitis › rectum (diffuse) (phlegmonous) (septic) (suppurative)
- Abscess › intestine, intestinal NEC › rectal (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
Excludes1 — never code together
The conditions below can never be reported together with K61.1 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- ischiorectal abscess (K61.39)
Inclusion terms
Alternative wording in documentation that is classified to K61.1.
- Perirectal abscess
Excludes2 — not included here — inherited from Chapter 11
The conditions below are not part of K61.1, but a patient may have both at the same time. When documentation supports it, K61.1 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 K61.1 existed?
K61.1 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.