2027 ICD-10-CM Diagnosis Code K91.86Retained cholelithiasis following cholecystectomy
ICD-10-CM Codes›K00–K95›K90-K95›K91
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
K91.86 is a billable ICD-10-CM diagnosis code for retained cholelithiasis following cholecystectomy. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 393 through 395, 791, 793. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 70 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Postprocedural or postoperative digestive system complication.
Code Identity
Code Classification
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to K91.86: its own notes plus those printed at K91 and Chapter 11. A note printed at a category, block or chapter applies to every code under it.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may 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)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name K91.86, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming K91.86: they are not reported together with it, unless the two conditions are unrelated.
- K80 Cholelithiasisretained cholelithiasis following cholecystectomy (K91.86)
Excludes2 1
These codes carry an Excludes2 note naming K91.86: its condition is not part of those codes, and both may be reported when the patient has both.
Index to Diseases and InjuriesGuidance
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
After Surgery
After any operation, you'll have some side effects. There is usually some pain with surgery. There may also be swelling and soreness around the area that the surgeon cut. Your surgeon can tell you which side effects to expect.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert K91.86 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About K91.86Overview
What is the ICD-10 code for retained cholelithiasis following cholecystectomy?
The ICD-10-CM code for retained cholelithiasis following cholecystectomy is K91.86 (sometimes written as K9186). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is K91.86 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report retained cholelithiasis following cholecystectomy on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does K91.86 group to?
When retained cholelithiasis following cholecystectomy is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 394, 395, 393, with relative weights from 0.6379 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Is K91.86 a CC or MCC?
CMS lists K91.86 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 70 closely related codes in its exclusion list.
What is the ICD-9 equivalent of K91.86?
Under the General Equivalence Mappings, retained cholelithiasis following cholecystectomy converts to ICD-9-CM 997.41 (ret cholelh fol cholecys). The mapping is a direct match.
