Sacral Pressure Ulcer With Eschar: Stage or Unstageable?
An 82-year-old woman is admitted to the hospital with dehydration and a sacral wound. The admission note describes a 4 cm by 3 cm ulcer over the sacrum covered entirely by a hard black eschar; there is no drainage, no undermining, and no exposed bone or tendon. The wound care nurse documents that depth cannot be measured because the eschar is adherent. The physician's impression lists 'stage 3 sacral pressure ulcer' and 'mild protein-calorie malnutrition.' A Braden score of 11 is recorded. The coder is assigning inpatient diagnosis codes for the stay. The hospital's CDI specialist notices that the wound was present on admission and that no debridement was performed during the stay. The attending documented the stage based on the nursing home record, which also said stage 3. The coder must decide whether to follow the physician's stage or assign a different code and whether a query is needed.
1. Which pressure ulcer code should be assigned, and what is the coder's reasoning?
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ICD-10-CM pressure ulcer codes require the site and the stage. The sacral site falls in the L89.15- family. A stage 3 ulcer requires full-thickness loss with visible subcutaneous fat; this wound is instead covered entirely by hard black eschar, and depth cannot be measured. Under ICD-10-CM, an ulcer covered by eschar is unstageable until the eschar is removed. The physician's 'stage 3' statement conflicts with the wound description, so the coder should not silently choose either option.
Send a non-leading query. If the physician confirms unstageable, assign the L89.15- code with the unstageable character. If the physician confirms stage 3, follow the provider's diagnostic statement and code stage 3, but keep the query and response in the record. The coder may not independently change the provider's stage. The malnutrition code is secondary and depends on the provider's documented type and severity; 'mild' does not support severe malnutrition.
2. Draft the physician query and explain how to handle a non-response.
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The query should be concise, include the clinical indicators, and offer options without leading the physician: 'The sacral wound is covered by adherent black eschar and the depth cannot be measured. Would you please clarify the stage? (a) unstageable due to eschar; (b) stage 3; (c) other: ______.' Avoid phrasing such as 'Do you agree the ulcer is unstageable?' because it suggests the answer.
If the physician does not respond, do not assign a code based on the coder's own clinical judgment. Follow the documented diagnosis, code stage 3 as stated, and flag the record for review. Re-query if the wound is debrided or if a subsequent note clarifies the stage. Document the query attempt in the coding audit trail. The coder's role is to clarify, not to diagnose.
3. What POA indicator applies, and why does it matter?
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The pressure ulcer was present on admission, so the POA indicator is Y. POA status is separate from the diagnosis code and affects hospital quality reporting, public reporting, and payment policies such as hospital-acquired condition reviews. A pressure ulcer that develops after admission may trigger a different review than one present on admission. The coder should verify the admission note and nursing assessment before assigning POA, and should not infer POA from the nursing home record alone if the hospital documentation is unclear.