ICD-10 code T23.052D: Burn of unspecified degree of left palm

Key takeaways

ICD-10 code T23.052D describes a burn of unspecified degree of the left palm, subsequent encounter. It is a billable ICD-10-CM code valid for FY2026 reimbursement.

The 7th character ‘D’ designates a subsequent encounter. Use it for any visit where active wound management continues after the initial evaluation.

T23.052D applies to the left palm only. T23.051D covers the right palm, and T23.059D covers unspecified laterality.

Practice management software like Pabau integrates with Claim.MD to validate ICD-10 codes, check payer eligibility, and submit burn claims electronically.

ICD-10 code T23.052D is a billable ICD-10-CM diagnosis code for a burn of unspecified degree of the left palm, subsequent encounter. It sits in the T23 category, burn and corrosion of wrist and hand, within the S00-T88 injury chapter of the CDC/NCHS ICD-10-CM system.

The code became effective on October 1, 2025 as part of the 2026 ICD-10-CM update. It is valid for use in HIPAA-covered transactions for reimbursement purposes. “Unspecified degree” means the documentation does not state whether the burn is first, second, or third degree. It does not mean the burn is minor.

Code description and clinical meaning

The anatomical site is the palmar surface of the left hand. It excludes the dorsum, the fingers, the thumb, and the wrist. Burns to the palm are clinically significant because the palm holds dense sensory nerve endings and flexor tendon structures. Damage at any depth can impair grip and fine motor function.

“Unspecified degree” does not imply a trivial injury. It means the provider did not document the burn degree, or the depth was clinically indeterminate at the encounter.

Per the CMS ICD-10-CM coding guidelines, coders assign the highest degree of specificity the documentation supports. When degree is genuinely absent from the note, unspecified codes like T23.052D are the correct choice.

The ICD-10-CM hierarchy for this code breaks down as follows:

• T20-T25: Burns and corrosions of external body surface, specified by site
• T23: Burn and corrosion of wrist and hand
• T23.0: Burn of unspecified degree of wrist and hand
• T23.05: Burn of unspecified degree of palm
• T23.052: Burn of unspecified degree of left palm
• T23.052D: Burn of unspecified degree of left palm, subsequent encounter

The same specificity rule runs through the whole T20-T25 range, so always code to the level of detail the record supports. Our complete ICD-10-CM code index lists the neighboring burn subcategories if a second site turns up in the note.

What the 7th character ‘D’ means

The 7th character is the most commonly misapplied element in injury coding. For T23.052D, the ‘D’ signals a subsequent encounter. The patient is receiving ongoing active treatment for the burn after the initial visit was coded.

The ‘D’ character applies whenever the wound is still healing and active treatment continues. That includes a wound care nurse performing a routine dressing change.

Selecting ‘A’ for a third or fourth follow-up visit is a common denial trigger. It tells the payer a new injury occurred rather than ongoing care for the same burn.

T23.052D vs its sibling codes

The T23.052 family covers all encounter types for unspecified-degree burns of the left palm. Related codes extend to the right palm and to unspecified laterality. Knowing the full sibling set prevents the laterality and encounter-type errors that trigger automatic edits.

The AAPC ICD-10-CM code lookup confirms these sibling codes and their billable status. Always verify laterality against the clinical note before choosing between T23.052D and T23.051D, because payers apply automatic edits for laterality mismatches.

The grid below pairs each laterality with each stage of care, so the right code falls out of two documented facts.

Applicable to and inclusion notes

The ICD-10-CM tabular includes “Applicable To” notes at the T23 category and subcategory levels. These tell coders which clinical presentations fall within the code’s scope and which do not.

Under T23.052D, the Applicable To notes from the parent category indicate:

• Burn NOS of left palm, where degree is not documented or clinically indeterminate
• Thermal burns, including contact with hot objects, flames, scalds, and radiant heat to the left palm
• Does NOT include burns from chemical agents (corrosion), which are coded in the T23.4x-T23.7x range
• Does NOT include burns of the fingers, thumb, wrist, or dorsum of the hand. Each has its own code within the T23 category
• Does NOT include sunburn (L55.-)

“Applicable To” notes are official inclusions, not optional guidance. If the clinical scenario matches one of them, the code applies.

Use additional code instructions

T23.052D carries “Use Additional Code” instructions. These are mandatory when the relevant clinical information is documented. Omitting them can result in incomplete claims or audit findings.

• Activity at time of injury (Y93.-): What the patient was doing (e.g. Y93.9 for unspecified activity)
• Place of occurrence (Y92.-): Where the burn happened (e.g. Y92.000 for kitchen at home)
• External cause code (X00-X19, X75-X77, X96-X98): The mechanism of the burn (e.g. X10.0 for contact with hot drinks)
• Complications: Any documented infection of the wound, such as L08.9 for local skin infection NOS

External cause codes are not always required by payers, but CMS expects them on inpatient claims. Include them whenever the documentation describes the mechanism, the place, and the activity in enough detail.

MS-DRG mapping and reimbursement

For inpatient hospital billing, ICD-10 code T23.052D maps to MS-DRG groupings under the CMS MS-DRG Definitions Manual. The assignment depends on whether a major complication or comorbidity (MCC) or a complication or comorbidity (CC) is present as a secondary diagnosis.

Payment rates vary by facility, payer contract, and fiscal year. Never quote a DRG dollar amount without checking the current CMS rate table.

For outpatient wound care, the procedure code on the claim drives reimbursement rather than the ICD-10 diagnosis. A dressing change or selective debridement carries its own code, and CPT 97597 is the one that pairs most often with burn follow-up visits.

Coding guidelines and documentation requirements

The ICD-10-CM Official Guidelines for Coding and Reporting (Section I.C.19) governs burn code assignment. Four rules bear directly on T23.052D.

• Sequence burns by severity: When multiple burns are present, sequence the highest-degree burn as the principal diagnosis. An unspecified-degree burn such as T23.052D follows any documented first-, second-, or third-degree burns at other sites.
• Assign codes for each site: Burns at multiple anatomical sites each require a separate code. Do not use a single unspecified-site code to cover several burn locations.
• Non-healing burns: These are treated as acute burns throughout the care episode. Keep using T23.052D even if wound care runs for many weeks, as long as the wound has not fully healed.
• Infection of the burn wound: Code the infection additionally when documented, such as B95.- for streptococcal or A49.- for other bacterial infection.
• Never estimate degree: If the provider’s note does not specify burn degree, do not infer it. Use the unspecified degree code and raise a provider query where the depth matters.

Keeping burn documentation current across follow-up visits reduces the query burden on coders. Structured clinical note templates help, because they prompt the provider to record degree, laterality, and wound status at every visit. The WHO ICD-10 browser holds the international hierarchy that underpins the ICD-10-CM American edition.

How Pabau supports accurate burn injury coding

A burn injury claim spans multiple visits and usually carries more than one code. The primary ICD-10 diagnosis sits alongside external cause codes, wound care procedure codes, and sometimes an infection code. Keeping them aligned across a multi-week wound care episode is where errors accumulate.

Pabau integrates with Claim.MD, our US clearinghouse partner, to validate ICD-10 codes against payer edits before submission. The check covers code validity, payer coverage rules, and real-time eligibility. It catches laterality mismatches and 7th character errors before a claim reaches the payer.

Built-in CPT and ICD-10 catalogues flag an incomplete code set at the point of entry. The coder fixes it before the claim leaves the practice.

Pabau also supports cleaner claims management across CMS-1500 and 837P formats, secondary claims, and corrected claims. That matters when an initial submission used the wrong encounter type. Getting the code set right the first time cuts days in accounts receivable and lowers the denial rate.

Patient records in Pabau link diagnosis codes to individual appointments. A coder reviewing a burn episode can see which visit was coded T23.052A and which follow-ups carry T23.052D. That audit trail shortens the response to a payer documentation request.

Stop burn coding errors before they reach the payer

Pabau integrates with Claim.MD to validate ICD-10 codes, check payer eligibility, and submit burn injury claims electronically. That cuts denials caused by laterality and 7th character errors.

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Conclusion

Burn injury billing fails most often when the 7th character and laterality do not match the clinical record. T23.052D is the right code for a left palm burn follow-up visit. Whether it holds up depends on what the provider documented about the encounter type, the side, and the degree.

One judgment is worth carrying forward. “Unspecified degree” belongs in the record only while the depth is genuinely undocumented. Once the note describes the depth, the specific-degree code takes over at the next visit.

Pabau’s integration with Claim.MD tests these details against payer rules before the claim goes out. Book a demo to see how that check runs against your own burn wound claims.

Continue your research

Need a full burn coding audit trail? Medical billing compliance explains how to document and retain records that support ICD-10 code selection across multi-visit injury episodes.

Unfamiliar with how clearinghouses validate ICD-10 claims? How the Claim.MD clearinghouse works walks through real-time eligibility checks, 837P submission, and ERA reconciliation for US practices.

Tracking denial trends by diagnosis code? Denial codes in medical billing covers the CARC codes payers return when an ICD-10 code fails their edit criteria.

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