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K80.51 ICD-10-CM Code: Calculus of bile duct without cholangitis or cholecystitis with obstruction

Compare with another codeCheck this code on a claim

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Tabular directives
1 Excludes1

Billable · FY2027A valid, specific ICD-10-CM code, reportable for dates of service in FY2027.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too; the Instructions section marks which is which.

Excludes1Never report with this code
  • retained cholelithiasis following cholecystectomy (K91.86)

Most relevant related codes MedCoder-derived

Read off the official notes above and this code’s own position in the tabular list. Which to report is a documentation question; Compare shows the two side by side.

CompareCheck ClaimView Related Codes

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v44, Appendix B.

  • MS-DRG 444 — DISORDERS OF THE BILIARY TRACT WITH MCC (MDC 07)
  • MS-DRG 445 — DISORDERS OF THE BILIARY TRACT WITH CC (MDC 07)
  • MS-DRG 446 — DISORDERS OF THE BILIARY TRACT WITHOUT CC/MCC (MDC 07)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for K80.51 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Notes without a marker are published on K80.51 itself; “inherited from” names the category or block whose note applies here.

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Source: inherited from K80

Coder workflow for K80.51

MedCoder structured workflow — derived from this code’s own official record

Before you code K80.51

  1. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with K80.51. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the documentation support a condition named in K80.51’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

    ReviewK91.86

Consider K80.51. Then confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).
The associated condition or complication
Whether the associated condition the title names is documented; the “with” convention presumes some links, and a provider statement that the conditions are unrelated defeats it (Guidelines I.A.15).

Official instructions as workflow

  • Excludes1 — check before selecting K80.51(1 note)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with K80.51: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareK91.86

    See the official tabular notes · Guidelines I.A.12.a

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: Both the condition K80.51 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

ReviewK91.86

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse K80.51 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of K80.51 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • K91.86— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of retained cholelithiasis following cholecystectomy moves the case to K91.86; the two are not reported together unless documented as unrelated.

    Full comparison: K80.51 vs K91.86 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Calculus of bile duct without cholangitis or cholecystitis with obstruction is a billable ICD-10-CM diagnosis code (K80.51).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Official Coding Guidelines

No excerpt in the ICD-10-CM Official Guidelines names this code specifically. Its chapter carries only this chapter-wide note:

Chapter 11: Diseases of the Digestive System (K00-K95)

Reserved for future guideline expansion

Verify Before Coding

  • CC as a secondary diagnosis (FY2027). Can raise the stay's MS-DRG severity tier.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder-derived relationships — computed from published CMS and AHRQ datasets

Other codes that name K80.51 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 4 Excludes1 notes: K81 — Cholecystitis (via K80.-), K82.0 — Obstruction of gallbladder (via K80.-), K82.4 — Cholesterolosis of gallbladder (via K80.-), K83.1 — Obstruction of bile duct (via K80.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 6 Use Additional Code instructions: D57.09 — Hb-SS disease with crisis with other specified complication (via K80.-), D57.218 — Sickle-cell/Hb-C disease with crisis with other specified complication (via K80.-), D57.418 — Sickle-cell thalassemia, unspecified, with crisis with other specified complication (via K80.-), D57.438 — Sickle-cell thalassemia beta zero with crisis with other specified complication (via K80.-), D57.458 — Sickle-cell thalassemia beta plus with crisis with other specified complication (via K80.-), D57.818 — Other sickle-cell disorders with crisis with other specified complication (via K80.-).

These codes instruct coders to additionally report this code when it applies.

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 36 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 3 MS-DRGs: DRG 444 (MDC 07), DRG 445 (MDC 07), DRG 446 (MDC 07).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):DIG017 — Biliary tract disease (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical process (MS-DRG)

Acts as CC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

K80.37 — Calculus of bile duct with acute and chronic cholangitis with obstruction, K80.40 — Calculus of bile duct with cholecystitis, unspecified, without obstruction, K80.41 — Calculus of bile duct with cholecystitis, unspecified, with obstruction, K80.42 — Calculus of bile duct with acute cholecystitis without obstruction, K80.43 — Calculus of bile duct with acute cholecystitis with obstruction, K80.44 — Calculus of bile duct with chronic cholecystitis without obstruction, K80.45 — Calculus of bile duct with chronic cholecystitis with obstruction, K80.46 — Calculus of bile duct with acute and chronic cholecystitis without obstruction, K80.47 — Calculus of bile duct with acute and chronic cholecystitis with obstruction, K80.50 — Calculus of bile duct without cholangitis or cholecystitis without obstruction, K80.60 — Calculus of gallbladder and bile duct with cholecystitis, unspecified, without obstruction, K80.61 — Calculus of gallbladder and bile duct with cholecystitis, unspecified, with obstruction, K80.62 — Calculus of gallbladder and bile duct with acute cholecystitis without obstruction, K80.63 — Calculus of gallbladder and bile duct with acute cholecystitis with obstruction, K80.64 — Calculus of gallbladder and bile duct with chronic cholecystitis without obstruction, K80.65 — Calculus of gallbladder and bile duct with chronic cholecystitis with obstruction, K80.66 — Calculus of gallbladder and bile duct with acute and chronic cholecystitis without obstruction, K80.67 — Calculus of gallbladder and bile duct with acute and chronic cholecystitis with obstruction, K80.70 — Calculus of gallbladder and bile duct without cholecystitis without obstruction, K80.71 — Calculus of gallbladder and bile duct without cholecystitis with obstruction, +15 more

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Biliary tract disease).

K80.37 — Calculus of bile duct with acute and chronic cholangitis with obstruction, K80.40 — Calculus of bile duct with cholecystitis, unspecified, without obstruction, K80.41 — Calculus of bile duct with cholecystitis, unspecified, with obstruction, K80.42 — Calculus of bile duct with acute cholecystitis without obstruction, K80.43 — Calculus of bile duct with acute cholecystitis with obstruction, K80.44 — Calculus of bile duct with chronic cholecystitis without obstruction, K80.45 — Calculus of bile duct with chronic cholecystitis with obstruction, K80.46 — Calculus of bile duct with acute and chronic cholecystitis without obstruction, K80.47 — Calculus of bile duct with acute and chronic cholecystitis with obstruction, K80.50 — Calculus of bile duct without cholangitis or cholecystitis without obstruction, K80.60 — Calculus of gallbladder and bile duct with cholecystitis, unspecified, without obstruction, K80.61 — Calculus of gallbladder and bile duct with cholecystitis, unspecified, with obstruction, K80.62 — Calculus of gallbladder and bile duct with acute cholecystitis without obstruction, K80.63 — Calculus of gallbladder and bile duct with acute cholecystitis with obstruction, K80.64 — Calculus of gallbladder and bile duct with chronic cholecystitis without obstruction, K80.65 — Calculus of gallbladder and bile duct with chronic cholecystitis with obstruction, K80.66 — Calculus of gallbladder and bile duct with acute and chronic cholecystitis without obstruction, K80.67 — Calculus of gallbladder and bile duct with acute and chronic cholecystitis with obstruction, K80.70 — Calculus of gallbladder and bile duct without cholecystitis without obstruction, K80.71 — Calculus of gallbladder and bile duct without cholecystitis with obstruction, +45 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Obstruction, obstructed, obstructive”, “Calculus, calculi, calculous”; these codes share that main term but sit in a different category of the Tabular List.

K56.51 — Intestinal adhesions [bands], with partial obstruction (intestine, with, adhesions, partial), K56.52 — Intestinal adhesions [bands] with complete obstruction (intestine, with, adhesions, complete), K56.600 — Partial intestinal obstruction, unspecified as to cause (intestine, partial), K56.601 — Complete intestinal obstruction, unspecified as to cause (intestine, complete), K56.609 — Unspecified intestinal obstruction, unspecified as to partial versus complete obstruction (intestine), K56.690 — Other partial intestinal obstruction (intestine, specified NEC, partial), K56.691 — Other complete intestinal obstruction (intestine, specified NEC, complete), K56.699 — Other intestinal obstruction unspecified as to partial versus complete obstruction (band), K62.4 — Stenosis of anus and rectum (rectum), K76.89 — Other specified diseases of liver (hepatic), K82.0 — Obstruction of gallbladder (gallbladder), K83.1 — Obstruction of bile duct (biliary), K86.89 — Other specified diseases of pancreas (pancreas), K90.2 — Blind loop syndrome, not elsewhere classified (lacteal, with steatorrhea), K91.30 — Postprocedural intestinal obstruction, unspecified as to partial versus complete (intestine, postoperative), K91.31 — Postprocedural partial intestinal obstruction (intestine, postoperative, partial), K91.32 — Postprocedural complete intestinal obstruction (intestine, postoperative, complete), N11.1 — Chronic obstructive pyelonephritis (pyelonephritis), N13.0 — Hydronephrosis with ureteropelvic junction obstruction (pelviureteral junction, with hydronephrosis), N13.1 — Hydronephrosis with ureteral stricture, not elsewhere classified (ureter NEC, with, hydronephrosis), +119 more

Lab tests where this diagnosis supports Medicare coverage (NCD)

Medicare's National Coverage Determination (NCD) program lists this diagnosis as medical justification for these lab tests.

Blood Glucose Test, Gamma-glutamyl Transferase (GGT) Test

Contextual Map

Every relationship of K80.51 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run K80.51 with these 10 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes

  • K81 — Cholecystitis[Excludes1](via K80.-): “cholecystitis with cholelithiasis (K80.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • K82.0 — Obstruction of gallbladder[Excludes1](via K80.-): “obstruction of gallbladder with cholelithiasis (K80.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • K82.4 — Cholesterolosis of gallbladder[Excludes1](via K80.-): “cholesterolosis of gallbladder with cholelithiasis (K80.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • K83.1 — Obstruction of bile duct[Excludes1](via K80.-): “obstruction of bile duct with cholelithiasis (K80.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027

Referenced by Use Additional Code instructions

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 07 — Diseases and Disorders of the Hepatobiliary System and Pancreas[MDC crossing]: “Diseases and Disorders of the Hepatobiliary System and Pancreas — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 2,488 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Index entries

  • Calculus, calculi, calculous, bile duct (common) (hepatic), with, obstruction[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Obstruction, obstructed, obstructive, bile duct or passage (common) (hepatic) (noncalculous), with calculus[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027

Nearest codes (40)

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

Indexed Clinical Terms (2)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Coding guidelines Official source data
ICD-10-CM Official Guidelines for Coding and Reporting (FY2027), quoted by section Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44 Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder-derived relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder editorial explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Labels on this page: Official source data · MedCoder-derived relationship · MedCoder editorial explanation. How to read the labels · All data sources and release dates · CMS coding rules

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "K80.51 — Calculus of bile duct without cholangitis or cholecystitis with obstruction." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/k80.51-calculus-of-bile-duct-without-cholangitis-or-cholecystitis-with-obstruction

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Calculus of bile duct without cholangitis or cholecystitis with obstruction

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027, and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to K80.51 in its code family, with their registry titles.

View all codes in the K80 family