ICD code T86.811 – Lung transplant failure

Key takeaways

T86.811 is the billable ICD-10-CM code for lung transplant failure, distinct from rejection (T86.810), infection (T86.812) and other complications (T86.818).

The T86 note calls for additional codes for other transplant complications, such as GVHD (D89.81-), PTLD (D47.Z1) or transplant-associated malignancy (C80.2).

Using T86.819 (unspecified) when the physician documents failure is a specificity error that invites denials and audit flags.

Pabau’s claims management software supports electronic claim submission through its Claim.MD integration, with eligibility checks and ERA posting.

ICD-10 code T86.811 is the billable code for a failed lung graft

ICD-10 code T86.811 identifies lung transplant failure, meaning the transplanted lung no longer works well enough to support the patient. It is a billable, specific code in subcategory T86.81, Complications of lung transplant. The code has existed since ICD-10-CM took effect on October 1, 2015.

It appears unchanged in the FY2026 and FY2027 CMS ICD-10-CM code files, so it stays valid for encounters from October 1, 2026. The table below collects the fields a coder checks before the claim leaves. For neighboring codes, browse our ICD-10-CM code directory.

T86.811 applies only when the physician documents failure

T86.811 applies when a transplanted lung has failed, meaning it no longer functions well enough to sustain the patient. In ICD-10-CM, “failure” means graft non-function or loss of graft viability, whether the decline is acute or chronic.

The physician or qualified practitioner must document “failure” explicitly. Declining pulmonary function test (PFT) results alone are not enough.

These clinical presentations map to T86.811.

• Acute lung allograft failure: graft function deteriorates rapidly in the early post-transplant period, and the transplant physician documents it as failure.
• Chronic lung allograft failure: graft function declines progressively over months to years and is documented as failure. Rejection is coded separately, to T86.810.
• Retransplantation driven by graft failure: failure of the original transplant is what leads the team to list the patient for retransplantation.
• Late graft loss: graft function is lost completely after the perioperative period, and the physician documents failure as the cause.

T86.811 does not cover rejection (T86.810), infection of the graft (T86.812), other documented complications (T86.818), or a complication whose type is not stated (T86.819). Separating failure from rejection is the most consequential coding decision in the T86.81x subgroup.

The tabular notes draw two hard lines around T86.811

ICD-10-CM places instructional notes at the T86 category and at the T86.81 subcategory. Both apply to T86.811, so read them before you code the encounter.

The heart-lung boundary is firm. A patient who received a heart-lung block and later loses graft function is coded T86.32, not T86.811. Mixing the two is an audit trigger at programs that perform both procedures. The CDC/NCHS ICD-10-CM web tool shows these notes inline with each code.

Official Guidelines section I.C.19.g.3.a adds one more rule. A T86 code is assigned only when the complication affects how the transplanted organ functions. Two codes then describe it fully: the T86 code, and a second code naming the complication.

Five T86.81x subcodes, and one documented word picks between them

The T86.81x subgroup holds five subcodes. Most errors in this family come from two habits. Coders reach for T86.819 when the record supports a specific code, or they confuse failure with rejection, which is T86.810.

Failure and rejection are different clinical events. Rejection is the immune system attacking the allograft, while failure is loss of graft function. Over time, rejection episodes can lead to failure, so T86.810 and T86.811 may each be right at different encounters.

Coding T86.810 when the note documents failure, or the reverse, misrepresents the case and invites payer queries. Check the exact term in the physician’s note, and query when it is ambiguous. The AAPC ICD-10-CM lookup gives the full tabular context for each code.

The path below shows how each documented term maps to its subcode.

PGD and CLAD codes depend on the physician’s exact wording

Two clinical entities cause most of the uncertainty around T86.811. They are primary graft dysfunction (PGD) and chronic lung allograft dysfunction (CLAD), and they differ in timing, mechanism and code mapping.

When a physician documents PGD-related failure right after transplant, T86.811 is the closest specific code. Even so, query the provider to confirm that “failure” is the right characterization. Never apply T86.811 to a PGD encounter without explicit documentation of failure.

For CLAD and BOS, the code turns entirely on the physician’s words. A note that says “chronic rejection” points to T86.810, with J44.81 added when BOS is documented.

The code-first note at J44.81 lists T86.810 and T86.818, but not T86.811. A note that says “graft failure” in the context of CLAD supports T86.811. When both terms appear, query the provider for the primary diagnosis.

Sequencing decides whether T86.811 leads the claim

Selecting T86.811 is only half the job. The Uniform Hospital Discharge Data Set (UHDDS) rules and the ICD-10-CM Official Guidelines decide where it sits on the claim.

1. Follow the T86 additional-code note. Code other documented transplant complications as well, such as GVHD (D89.81-), PTLD (D47.Z1) or transplant-associated malignancy (C80.2). Z94.2 is not added, because Z94 excludes transplant complications.
2. T86.811 as principal diagnosis. When the admission is chiefly for lung transplant failure, confirmed after study, T86.811 is sequenced first.
3. T86.811 as secondary diagnosis. When the patient presents for a separate condition but graft failure affects management, T86.811 follows the presenting condition.
4. Add a code that names the complication. Guideline I.C.19.g.3.a calls for two codes to describe a transplant complication fully. A documented contributing cause, such as an adverse drug reaction, is coded too.
5. Do not report T86.819 with T86.811. Pairing the specific failure code with the unspecified complication code on one encounter is redundant and attracts edit flags.

What the record must show to support T86.811

Payers look closely at lung transplant failure claims because the encounters are expensive. Thorough notes are also the base of a clean claim submission that clears on the first pass.

These elements substantiate T86.811.

• The physician’s word “failure”: The transplant physician writes “failure”, “graft loss” or “graft non-function” in the operative note, discharge summary or progress note. Spirometry or imaging findings alone do not count as failure documentation.
• Pulmonary function trends: Record PFT results showing progressive decline, including FEV1 values and percentage of predicted. They support the clinical basis for the failure diagnosis.
• Bronchoscopy and biopsy findings: Surveillance biopsies, bronchoalveolar lavage (BAL) cytology and transbronchial biopsy pathology help separate failure from rejection when both are possible.
• A clear timeline: The record runs from the original transplant to this encounter. It includes prior rejection episodes, the immunosuppression regimen and any earlier T86.810, T86.812 or T86.818 claims.
• Plan of care: Document the response to the failure, such as retransplant listing, palliative transition or intensified immunosuppression. It shows why the diagnosis matters clinically.

Consistent wording across transplant encounters is a medical billing compliance requirement as well as a coding habit. Auditors check whether the record’s terms match the coded diagnosis from one visit to the next.

How a T86.811 claim moves from the chart to payment

Here is the path a typical outpatient follow-up takes, and where it tends to snag.

1. Encounter note. The transplant pulmonologist documents “graft failure”, the supporting findings and the plan.
2. Coding. The coder assigns T86.811, adds any code naming the complication, and checks the T86 note for GVHD, PTLD or malignancy.
3. Charge entry and scrub. The claim scrubber checks required fields and payer edits before the claim is released.
4. Clearinghouse. The 837P file goes to the payer, and the clearinghouse returns acceptance or rejection reports.
5. Adjudication and remittance. The payer pays, denies or asks for records, and the electronic remittance advice (ERA) arrives with any denial codes.

Worked example: A patient returns four years after a bilateral lung transplant. The note reads “CLAD with progressive graft failure, referred for retransplant evaluation.” That wording supports T86.811 directly.

Now suppose the note had said only “CLAD, BOS phenotype.” The coder would query first, because BOS alone points toward T86.810 or T86.818 with J44.81. One query at step two saves a denial at step five.

Check these six points before you submit a T86.811 claim

Run through this list at charge entry. Each line maps to a denial pattern covered further down.

• The physician’s note uses “failure”, “graft loss” or “graft non-function”.
• The transplant was lung only, not a heart-lung block coded to T86.3-.
• No T86.819 sits on the same claim as T86.811.
• Z94.2 is not listed alongside the T86.81x code.
• Any documented GVHD (D89.81-), PTLD (D47.Z1) or transplant-associated malignancy (C80.2) is coded too.
• The principal diagnosis matches the main reason for the encounter.

Medicare covers T86.811 care when the transplant program qualified

Medicare has no national coverage determination (NCD) for lung transplantation. Coverage rests on the transplant being performed at a CMS-approved lung transplant program, a framework Medicare set out in the Federal Register in 1995. Follow-up care for lung transplant failure is covered when the original transplant met those criteria.

Keep these coverage points in mind for T86.811 claims.

• CMS-approved lung transplant program: The transplant must have been performed at a CMS-approved lung transplant program. Care tied to a transplant done elsewhere may be denied, however accurate the coding.
• Medicare Advantage rules: These plans may set their own prior authorization rules for admissions related to T86.811. Verify them before admission when you can.
• Local Coverage Determinations (LCDs): Medicare Administrative Contractors (MACs) can publish LCDs with extra documentation rules. Check your MAC’s LCD database for any policy that lists T86.811.
• Immunosuppressant drugs: Medicare Part B covers immunosuppressive drugs after a Medicare-covered transplant. Make sure the pharmacy claim’s diagnosis matches the medical record.

Five denial patterns that trip up T86.811 claims

T86.811 claims fail in predictable ways, so catching them before submission beats appealing them later. A structured denial management workflow sorts these patterns by cause. Billing teams can then fix the source instead of working one remittance at a time.

How Pabau keeps T86.811 claims moving from record to payer

When the chart and the billing tool are separate systems, staff rekey each diagnosis by hand. Every retyped claim is another chance for T86.811 to become T86.812, or for a missing member ID to bounce the file.

Pabau, the practice management and billing platform we build, pre-fills the CMS-1500 from the patient record. Its ICD-10-CM lookup library lets coders search the T86.81x family without leaving the claim. With streamlined claims management, a claim can’t be sent until required fields, such as member numbers and authorization codes, are complete.

In the US, claims go out through the Claim.MD integration, with real-time eligibility checks before the visit and ERA posting after it. Claim status sits in one place, so a denied T86.811 claim gets worked before it ages in a queue.

Managing transplant billing is complex. Pabau makes it simpler.

From record-based claim forms to electronic submission through Claim.MD, Pabau gives transplant and specialist practices one system to document, code and submit claims.

Book a demo

Conclusion

T86.811 rewards precision and punishes guesswork. Two decisions matter most: separating failure from rejection (T86.810), and making sure the physician writes “failure” in plain terms. Get both right, and the code, the record and the payer’s view of the case line up.

The cheapest fix sits upstream. A one-line query to the transplant team takes minutes, while a denied inpatient claim can tie up revenue for weeks. If your practice bills transplant follow-up often, build that query into the workflow rather than relying on coders to catch it.

Book a demo to see how Pabau moves transplant claims from the patient record to Claim.MD with fewer manual steps.

Continue your research

Need to understand how clearinghouse submission works for complex ICD-10 claims? Claim.MD clearinghouse overview explains how electronic claim routing and payer validation work end-to-end.

Want to reduce first-pass denial rates across your transplant billing team? Denial codes in medical billing covers the most common CARC codes your team will see on T86.81x remittances.

Looking for guidance on clean claim best practices for specialist practices? Superbill documentation guide covers what clinical data must appear on the superbill to support ICD-10 specificity at the time of service.

Coding a lung recipient with no graft complication? ICD-10 code Z94.2 covers lung transplant status and when it applies instead of a T86 code.

Frequently asked questions