FY2027 ICD-10-CM reference
T86.5: Complications of stem cell transplant
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Complications of stem cell transplant. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Billable code. Verified against the official FY2027 order file.
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Instructional note
Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
Source: S00-T88 (chapter, inherited).
Instructional note
code to identify any retained foreign body, if applicable (Z18.-)
Source: S00-T88 (chapter, inherited).
Excludes2
birth trauma (P10-P15)
Source: S00-T88 (chapter, inherited).
Excludes2
obstetric trauma (O70-O71)
Source: S00-T88 (chapter, inherited).
Instructional note
The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.
Source: S00-T88 (chapter, inherited).
Instructional note
code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
Source: T80-T88 (section, inherited).
Instructional note
code(s) to identify the specified condition resulting from the complication
Source: T80-T88 (section, inherited).
Instructional note
code to identify devices involved and details of circumstances (Y62-Y82)
Source: T80-T88 (section, inherited).
Excludes2
any encounters with medical care for postprocedural conditions in which no complications are present, such as:
Source: T80-T88 (section, inherited).
Excludes2
artificial opening status (Z93.-)
Source: T80-T88 (section, inherited).
Excludes2
closure of external stoma (Z43.-)
Source: T80-T88 (section, inherited).
Excludes2
fitting and adjustment of external prosthetic device (Z44.-)
Source: T80-T88 (section, inherited).
Excludes2
burns and corrosions from local applications and irradiation (T20-T32)
Source: T80-T88 (section, inherited).
Excludes2
complications of surgical procedures during pregnancy, childbirth and the puerperium (O00-O9A)
Source: T80-T88 (section, inherited).
Excludes2
mechanical complication of respirator [ventilator] (J95.850)
Source: T80-T88 (section, inherited).
Excludes2
poisoning and toxic effects of drugs and chemicals (T36-T65 with fifth or sixth character 1-4 or 6)
Source: T80-T88 (section, inherited).
Excludes2
postprocedural fever (R50.82)
Source: T80-T88 (section, inherited).
Excludes2
specified complications classified elsewhere, such as:
Source: T80-T88 (section, inherited).
Excludes2
cerebrospinal fluid leak from spinal puncture (G97.0)
Source: T80-T88 (section, inherited).
Excludes2
colostomy malfunction (K94.0-)
Source: T80-T88 (section, inherited).
Excludes2
disorders of fluid and electrolyte imbalance (E86-E87)
Source: T80-T88 (section, inherited).
Excludes2
functional disturbances following cardiac surgery (I97.0-I97.1)
Source: T80-T88 (section, inherited).
Excludes2
intraoperative and postprocedural complications of specified body systems (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95.6-, J95.7, K91.6-, L76.-, M96.-, N99.-)
Source: T80-T88 (section, inherited).
Excludes2
ostomy complications (J95.0-, K94.-, N99.5-)
Source: T80-T88 (section, inherited).
Excludes2
postgastric surgery syndromes (K91.1)
Source: T80-T88 (section, inherited).
Excludes2
postlaminectomy syndrome NEC (M96.1)
Source: T80-T88 (section, inherited).
Excludes2
postmastectomy lymphedema syndrome (I97.2)
Source: T80-T88 (section, inherited).
Excludes2
postsurgical blind-loop syndrome (K91.2)
Source: T80-T88 (section, inherited).
Excludes2
ventilator associated pneumonia (J95.851)
Source: T80-T88 (section, inherited).
Instructional note
code to identify other transplant complications, such as:
Source: T86 (category, inherited).
Instructional note
graft-versus-host disease (D89.81-)
Source: T86 (category, inherited).
Instructional note
malignancy associated with organ transplant (C80.2)
Source: T86 (category, inherited).
Instructional note
post-transplant lymphoproliferative disorders (PTLD) (D47.Z1)
Source: T86 (category, inherited).
Instructional note
Complications from stem cells from peripheral blood
Source: T86.5 (self, direct).
Instructional note
Complications from stem cells from umbilical cord
Source: T86.5 (self, direct).
Compare the FY2027 additions, removals and billable-status changes
What does T86.5 mean in FY2027?
The official ICD-10-CM descriptor is Complications of stem cell transplant. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is T86.5 billable in FY2027?
The FY2027 order file marks T86.5 as billable. Check the complete Tabular instructions and documentation before assigning it.
Does T86.5 map to an HCC?
In the CMS 2027 Initial ICD-10-CM Mappings (payment year 2027, 2026 dates of service), T86.5 maps to CMS-HCC V28 HCC 454 (Stem Cell, Including Bone Marrow, Transplant Status/Complications). For 2027 dates of service, CMS has not yet published the payment year 2028 mappings. ESRD, RxHCC, PACE and HHS-HCC mappings are still pending verification for FY2027.
Source: CMS FY2027 ICD-10-CM order file. Read the FY2027 Official Guidelines.
Review the FY2026 April edition