K80.66 — Calculus of gallbladder and bile duct with acute and chronic cholecystitis without obstruction

BillableCC

Is K80.66 billable?

Yes — K80.66 is billable for FY2027. K80.66 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. K80.66 may be submitted for encounters from October 1, 2026 through September 30, 2027.

K80.66 at a glance

Code	K80.66
Description	Calculus of gallbladder and bile duct with acute and chronic cholecystitis without obstruction
Billable	Yes
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Which MS-DRGs does K80.66 group to?

K80.66 sits in MDC 07 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.

444Disorders of the Biliary Tract with MCCmedical
445Disorders of the Biliary Tract with CCmedical
446Disorders of the Biliary Tract without CC/MCCmedical

As a secondary diagnosis, K80.66 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.

How is K80.66 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to K80.66. They show the wording a clinician may have documented, which often differs from the Tabular description.

Calculus, calculi, calculous › gallbladder and bile duct › with › cholecystitis › acute › with › chronic cholecystitis
Calculus, calculi, calculous › gallbladder and bile duct › with › cholecystitis › chronic › with › acute cholecystitis

Excludes1 — never code together — inherited from K80

The conditions below can never be reported together with K80.66 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

retained cholelithiasis following cholecystectomy (K91.86)

Use additional code — inherited from K80.6

Report an additional code alongside K80.66 to fully describe the condition. K80.66 is sequenced first.

code if applicable for associated gangrene of gallbladder (K82.A1), or perforation of gallbladder (K82.A2)

Excludes2 — not included here — inherited from Chapter 11

The conditions below are not part of K80.66, but a patient may have both at the same time. When documentation supports it, K80.66 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 K80.66 existed?

K80.66 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.