ICD code T31.76 – Burns involving 70-79% of body surface with 60-69% third degree burns

Key takeaways

ICD-10 Code T31.76 covers burns involving 70-79% of body surface with 60-69% third-degree burns, effective October 1, 2025.

T31.76 is billable on a claim, while its parent code T31.7 is not.

The sixth character measures third-degree injury against the burned area, not against the whole body.

Documentation must state the TBSA percentage, the third-degree share, the body regions burned, and the cause of injury.

Practice management software like Pabau submits and tracks these claims once the record holds the required detail.

ICD-10 Code T31.76: quick reference and billable status

T31.76 is a billable, specific ICD-10-CM code. It can be used directly on a claim for reimbursement. Below is the at-a-glance reference coders need most.

What does ICD-10 Code T31.76 mean? Understanding the code structure

The alphanumeric structure of T31.76 encodes three distinct clinical concepts in six characters. Each segment tells a payer something precise about the injury.

• T31 – The parent category. Classifies burns according to the extent of body surface involved, as measured by total body surface area (TBSA). This category is site-neutral. It does not specify whether the burn is on the arm, torso, or face.
• .7 – The fourth and fifth characters. Specifies that the burns involve 70-79% of total body surface area.
• 6 – The sixth character (the sub-classifier). Specifies that 60-69% of the total burn area involves third-degree (full-thickness) burns.

The two figures do not share a denominator. The fifth character measures the burn against the whole body. The sixth measures third-degree injury against the burned area alone. Miss either figure and the code cannot be supported on audit.

T31 burn codes ICD-10-CM: category overview and hierarchy

The T31 category classifies burns by extent of body surface involved, not by site or cause. It runs from T31.0 (less than 10% TBSA) through T31.9 (90% or more TBSA). Many severe burns therefore need two codes, because a T20-T25 code records the site and a T31 code records the extent.

T31.76 sits within the T31.7 subcategory for 70-79% TBSA. It is one of ten codes there, separated only by the sixth character. That character records the third-degree share, which the next section sets out in full.

How TBSA is calculated: rule of nines and clinical documentation

Selecting T31.76 requires a documented TBSA calculation. Two validated methods are in clinical use, the Rule of Nines and the Lund-Browder chart. The WHO ICD-10 classification does not mandate a measurement tool. But the documented figure has to sit in the clinical record to justify the code.

Rule of nines

The Rule of Nines divides the adult body into regions, each representing 9% of total body surface area (or multiples of 9%). Head and neck: 9%. Each arm: 9%. Each leg: 18%. Anterior trunk: 18%. Posterior trunk: 18%. Perineum: 1%. To reach 70-79% TBSA, a burn would typically involve the entire trunk plus both legs, or equivalent combinations.

Lund-Browder chart

The Lund-Browder chart adjusts for age-related body proportion differences, making it more accurate for pediatric patients. Burns of 70-79% TBSA in a child require this chart for defensible documentation. Either method is acceptable provided the clinician records the figure in the patient record.

Both figures must appear in physician documentation before the coder assigns T31.76. Query the provider if either value is missing rather than making an assumption.

Third-degree burn percentage sub-classification: the sixth digit explained

The sixth digit in the T31.7x subcategory specifies what proportion of the total burn area involves third-degree (full-thickness) injury. This is where T31.76 gets its clinical specificity. Third-degree burns destroy all layers of the dermis and often extend into subcutaneous tissue, requiring grafting and long-term reconstructive care.

Grafting carries its own coding trail. Surgical preparation of the recipient site on the trunk, arms, or legs is reported with CPT code 15002.

T31.76 sits at the 60-69% third-degree mark. A patient with 75% TBSA burns where 65% of that area is full-thickness maps precisely to this code. Document both figures in the attending physician’s note before assigning.

Coding guidelines and sequencing rules for T31.76

Per the ICD-10-CM Official Guidelines for Coding and Reporting, T31.76 is used alongside site-specific burn codes rather than as a standalone replacement. The sequencing hierarchy below is what keeps these claims from coming back.

T31 vs T32: burns vs corrosions

T31 codes apply to thermal burns (heat, flame, radiation, electricity, friction). T32 codes are the parallel category for corrosions (chemical burns). If a patient sustains chemical burns covering 70-79% TBSA with 60-69% third-degree involvement, the correct code is T32.76, not T31.76. The cause of injury determines which category applies.

Sequencing with site-specific codes (T20-T25)

When both a site-specific code and an extent code apply, the site-specific code from T20-T25 is sequenced first. In most inpatient encounters it becomes the principal diagnosis. T31.76 follows as an additional code capturing total burn extent. That pairing supports DRG assignment and reflects the severity of the case.

External cause codes

Assign an external cause code (from the X00-X19 range or similar) to identify the mechanism of injury. For example, X00 codes cover exposure to uncontrolled fire. This is not always required for reimbursement, but per ICD-10-CM guidelines, external cause codes should be assigned to the full extent possible when reported.

Additional codes for complications

Burns of this extent frequently involve secondary diagnoses. Assign additional codes for sepsis, infections, fluid imbalance, inhalation injury, or any other documented complication. Each complication code must be supported by the physician’s documentation. Do not infer a complication from clinical notes alone.

Documentation requirements to support T31.76

This is where claims for burns coded under ICD-10 Code T31.76 most commonly fail. The elements below have to be present in the physician’s record. A coder cannot infer them from nursing notes or operative reports alone.

• TBSA percentage: The attending physician must explicitly state the total body surface area burned as a percentage (e.g., “75% TBSA”). The coder cannot calculate this from a body diagram alone.
• Third-degree burn percentage: The physician must state what proportion of the total burn involves full-thickness injury (e.g., “approximately 65% of the burn is third-degree”). This drives the sixth-digit selection.
• Body regions involved: Documentation of which anatomical regions are burned supports any co-assigned site-specific codes (T20-T25).
• Cause of burn: Thermal vs. chemical determines T31 vs. T32; fire vs. scalding vs. electrical determines the external cause code.
• Burn depth terminology: Clinician notes should use ICD-10-CM-aligned language. “Third-degree,” “full-thickness,” and “full thickness” are all acceptable. “Severe burn” without a depth specification is not.

Billing and reimbursement: submitting claims for T31.76

Burns coded to ICD-10 Code T31.76 typically represent critical care admissions with high resource intensity. Claims for these encounters usually group under the major burn DRGs, and payers scrutinize them for documentation quality.

Practice management software like Pabau connects to the Claim.MD clearinghouse for electronic claim submission across thousands of US payers. Burn center billing teams can submit CMS-1500 and 837P claims and receive electronic remittance advice as 835 files. Tracking the medical billing denial codes that come back is what shortens the appeal cycle.

Per the CDC/NCHS ICD-10-CM web tool, T31.76 is valid for FY2026 encounters (discharges and outpatient encounters on or after October 1, 2025). Verify code validity annually, as ICD-10-CM updates occur every October 1.

Adjacent and related ICD-10 codes to T31.76

Coders working with T31.76 regularly cross-reference adjacent codes in the T31.7x subcategory. The AAPC ICD-10-CM code lookup provides a searchable reference for the full T31 hierarchy. Below are the immediately adjacent codes and their descriptions.

Synonyms and alternate descriptions for T31.76

The following alternate descriptions and approximate synonyms are recognized for ICD-10 Code T31.76. These appear in clinical documentation, charge capture notes, and coding software queries.

• Burns involving 70-79% of body surface with 60-69% third-degree burns
• Burns of 70 to 79 percent body surface area with 60 to 69 percent full-thickness burns
• Major burns, 70-79% TBSA, 60-69% third-degree
• Extensive burns involving 70-79% BSA, predominantly full-thickness
• T31.76 (ICD-10-CM diagnosis code, FY2026 edition)

Clinical context: when is T31.76 used in practice?

Burns involving 70-79% TBSA with a majority of full-thickness injury represent some of the most resource-intensive cases in acute care. ICD-10 Code T31.76 applies in a defined set of clinical scenarios.

• Mass casualty events: Explosions, industrial fires, and building collapses can produce multiple patients with critical TBSA burns. Burn center teams use T31.76 for patients with 70-79% TBSA burns where documentation confirms 60-69% third-degree involvement.
• Critical care admissions: These patients require immediate fluid resuscitation (Parkland formula or equivalent), ICU-level monitoring, and often mechanical ventilation. T31.76 accompanies DRG groupings that reflect this intensity.
• Burn center transfers: Patients transferred from community hospitals to regional burn centers for definitive care. The transferring facility and receiving facility each need accurate TBSA and depth documentation to support T31.76 at their respective encounters.
• Pediatric burns: Children with 70-79% TBSA burns from scalding, flame, or electrical injury. The Lund-Browder chart is preferred for TBSA calculation. The coding logic for T31.76 stays the same.

Burn centers tracking outcomes and resource use rely on accurate T31-coded data. Understating burn extent through the wrong T31 code lowers the severity the claim reports, and the reimbursement with it.

How claims management software supports T31.76 documentation

In most burn units the coder finds the missing depth figure after the encounter closes. The claim then waits on an email or a phone call to the attending physician. Days pass before the record says what the sixth character needs.

Pabau’s claims management software keeps the clinical record and the claim in one system. The TBSA figure and the depth split are recorded in structured fields at the point of care. Coding stays with the coder, who reads that note and assigns T31.76 from it.

The billing team then submits and tracks the claim from the same record, without retyping payer detail into a separate portal. Fewer retrospective queries reach the physician, and fewer claims come back asking what the burn extent was.

Streamline burn case billing with Pabau

Pabau’s claims management tools help burn units and critical care teams submit accurate, documentation-supported claims for complex ICD-10 codes like T31.76. Book a demo to see how it works.

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Conclusion

Two figures decide this code, and they answer to different totals. Get the TBSA percentage and the third-degree share into the physician’s note, and T31.76 stops being a coding judgment call. Sequence it behind the T20-T25 site codes and the claim reports the severity the case carried.

The query to the attending physician is cheaper than the appeal, every time. Book a demo to see how Pabau keeps burn documentation and claim submission in one record.

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