Skip to main content

Y65.0 ICD-10-CM Code: Mismatched blood in transfusion

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 · 1 Excludes2

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
  • surgical and medical procedures as the cause of abnormal reaction of the patient, without mention of misadventure at the time of the procedure (Y83-Y84)
Excludes2Not included here; may be reported together
  • breakdown or malfunctioning of medical device (during procedure) (after implantation) (ongoing use) (Y70-Y82)

CompareCheck ClaimView Related Codes

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for Y65.0 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 Y65.0 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).

  • surgical and medical procedures as the cause of abnormal reaction of the patient, without mention of misadventure at the time of the procedure (Y83-Y84) Compare Y65.0 vs Y83 →

Source: inherited from Y62-Y69

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Source: inherited from Y62-Y69

Coder workflow for Y65.0

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

Before you code Y65.0

  1. An external cause code is reported in addition to the code for the injury or condition, never as the principal or first-listed diagnosis. Confirm the cause, intent, place of occurrence, activity and status where the record documents them, and assign the 7th character that matches the injury code. External cause coding guidelines (Guidelines I.C.20.a).

  2. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with Y65.0. 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 Y65.0’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.

Consider Y65.0. 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).

Official instructions as workflow

  • Excludes1 — check before selecting Y65.0(1 note)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with Y65.0: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

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

  • Excludes2 — not part of Y65.0(1 note)

    Coding workflow: The conditions named in this note are not included in Y65.0. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

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

Coding decision scenarios

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

Documentation: Both the condition Y65.0 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).

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 Y65.0 with…

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

The codes most likely to be picked instead of Y65.0 — 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.

  • Y83— 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 surgical and medical procedures as the cause of abnormal reaction of the patient, without mention of misadventure at the time of the procedure moves the case to Y83; the two are not reported together unless documented as unrelated.

    Full comparison: Y65.0 vs Y83 →

  • Y84— 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 surgical and medical procedures as the cause of abnormal reaction of the patient, without mention of misadventure at the time of the procedure moves the case to Y84; the two are not reported together unless documented as unrelated.

    Full comparison: Y65.0 vs Y84 →

  • Y70— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of breakdown or malfunctioning of medical device (during procedure) (after implantation) (ongoing use) adds Y70; it is not part of this code and both may be reported when both are documented.

    Full comparison: Y65.0 vs Y70 →

  • Y82— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of breakdown or malfunctioning of medical device (during procedure) (after implantation) (ongoing use) adds Y82; it is not part of this code and both may be reported when both are documented.

    Full comparison: Y65.0 vs Y82 →

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

Mismatched blood in transfusion is a billable ICD-10-CM diagnosis code (Y65.0).

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

Verify Before Coding

  • Principal-diagnosis restriction. External cause of morbidity codes (V, W, X and Y) describe the circumstance that caused an injury, not the condition treated. The Medicare Code Editor rejects them as a principal diagnosis; sequence the injury or condition first and report this code as secondary.

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 Y65.0 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 3 Excludes1 notes: Y83 — Surgical operation and other surgical procedures as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure (via Y65.-), Y83-Y84 — Surgical and other medical procedures as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure (Y83-Y84) (via Y65.-), Y84 — Other medical procedures as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure (via Y65.-).

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

Referenced by 14 Excludes2 notes: Y70 — Anesthesiology devices associated with adverse incidents (via Y65.-), Y70-Y82 — Medical devices associated with adverse incidents in diagnostic and therapeutic use (Y70-Y82) (via Y65.-), Y71 — Cardiovascular devices associated with adverse incidents (via Y65.-), Y72 — Otorhinolaryngological devices associated with adverse incidents (via Y65.-), Y73 — Gastroenterology and urology devices associated with adverse incidents (via Y65.-), Y74 — General hospital and personal-use devices associated with adverse incidents (via Y65.-), Y75 — Neurological devices associated with adverse incidents (via Y65.-), Y76 — Obstetric and gynecological devices associated with adverse incidents (via Y65.-), Y77 — Ophthalmic devices associated with adverse incidents (via Y65.-), Y78 — Radiological devices associated with adverse incidents (via Y65.-), Y79 — Orthopedic devices associated with adverse incidents (via Y65.-), Y80 — Physical medicine devices associated with adverse incidents (via Y65.-), Y81 — General- and plastic-surgery devices associated with adverse incidents (via Y65.-), Y82 — Other and unspecified medical devices associated with adverse incidents (via Y65.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

Referenced by 10 Use Additional Code instructions: T80 — Complications following infusion, transfusion and therapeutic injection (via Y65.-), T80-T88 — Complications of surgical and medical care, not elsewhere classified (T80-T88) (via Y65.-), T81 — Complications of procedures, not elsewhere classified (via Y65.-), T82 — Complications of cardiac and vascular prosthetic devices, implants and grafts (via Y65.-), T83 — Complications of genitourinary prosthetic devices, implants and grafts (via Y65.-), T84 — Complications of internal orthopedic prosthetic devices, implants and grafts (via Y65.-), T85 — Complications of other internal prosthetic devices, implants and grafts (via Y65.-), T86 — Complications of transplanted organs and tissue (via Y65.-), T87 — Complications peculiar to reattachment and amputation (via Y65.-), T88 — Other complications of surgical and medical care, not elsewhere classified (via Y65.-).

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

Clinical classification (AHRQ CCSR):EXT025 — External cause codes: complications of medical and surgical care, initial encounter.

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 category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (External cause codes: complications of medical and surgical care, initial encounter).

Y63.3 — Inadvertent exposure of patient to radiation during medical care, Y63.4 — Failure in dosage in electroshock or insulin-shock therapy, Y63.5 — Inappropriate temperature in local application and packing, Y63.6 — Underdosing and nonadministration of necessary drug, medicament or biological substance, Y63.8 — Failure in dosage during other surgical and medical care, Y63.9 — Failure in dosage during unspecified surgical and medical care, Y64.0 — Contaminated medical or biological substance, transfused or infused, Y64.1 — Contaminated medical or biological substance, injected or used for immunization, Y64.8 — Contaminated medical or biological substance administered by other means, Y64.9 — Contaminated medical or biological substance administered by unspecified means, Y65.1 — Wrong fluid used in infusion, Y65.2 — Failure in suture or ligature during surgical operation, Y65.3 — Endotracheal tube wrongly placed during anesthetic procedure, Y65.4 — Failure to introduce or to remove other tube or instrument, Y65.51 — Performance of wrong procedure (operation) on correct patient, Y65.52 — Performance of procedure (operation) on patient not scheduled for surgery, Y65.53 — Performance of correct procedure (operation) on wrong side or body part, Y65.8 — Other specified misadventures during surgical and medical care, Y66 — Nonadministration of surgical and medical care, Y69 — Unspecified misadventure during surgical and medical care, +96 more

Contextual Map

Every relationship of Y65.0 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 Y65.0 with these 19 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes

Referenced by Excludes2 notes (14)

Referenced by Use Additional Code instructions (10)

Clinical classification (CCSR)

External cause index

  • Misadventureduring surgical or medical care (s) to patient(s), mismatched blood in transfusion[External cause term]— CMS External Cause of Injuries Index · icd10cm-fy2027
  • Misadventureduring surgical or medical care (s) to patient(s), specified type NEC, transfusion of mismatched blood[External cause term]— CMS External Cause of Injuries Index · icd10cm-fy2027
  • Misadventureduring surgical or medical care (s) to patient(s), transfusion, mismatched blood[External cause term]— CMS External Cause of Injuries Index · icd10cm-fy2027
  • Mismatched blood in transfusion[External cause term]— CMS External Cause of Injuries Index · icd10cm-fy2027

Nearest codes (10)

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 As (4)

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

Circumstance phrases from the official ICD-10-CM External Cause of Injuries Index that map to this code.

  • Misadventureduring surgical or medical care (s) to patient(s), mismatched blood in transfusion
  • Misadventureduring surgical or medical care (s) to patient(s), specified type NEC, transfusion of mismatched blood
  • Misadventureduring surgical or medical care (s) to patient(s), transfusion, mismatched blood
  • Mismatched blood in transfusion

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
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) 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 20, 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. "Y65.0 — Mismatched blood in transfusion." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/y65.0-mismatched-blood-in-transfusion

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Mismatched blood in transfusion

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 Y65.0 in its code family, with their registry titles.

View all codes in the Y65 family