16.3 Present-on-Admission Indicator Assignment and Payment Impact

16.3 Present-on-Admission Indicator Assignment and Payment Impact

Quick Answer: Assign POA at the inpatient admission order. Y = present; N = not present; U = documentation insufficient; W = provider clinically unable to determine. Conditions that develop in the ED, observation, or outpatient surgery before that order are Y. For the CMS HAC payment provision, N and U generally prevent the condition from acting as a CC/MCC; W is paid like Y. Do not merge this claim-level rule with the HAC Reduction Program.

This independent OpenExamPrep section uses CMS IPPS POA reporting and the ICD-10-CM Official Guidelines POA reporting section. It is not a CMS or ACDIS handbook reprint.

The clock: inpatient order, not hospital arrival

Present on admission means present at the time the order for inpatient admission occurs. That timestamp—not door time, not triage, not the first vital signs—is the POA dividing line for IPPS claims from subsection (d) hospitals that must report POA.

Conditions that develop during an outpatient encounter that immediately precedes the inpatient order are still POA = Y. CMS and the Official Guidelines treat the following as present on admission when they occur before the inpatient order:

• Emergency department care
• Observation
• Outpatient surgery (including a patient who is then admitted as an inpatient because of a complication or a decision to continue hospital care)

Example Y, not N. A patient arrives in the ED in sinus rhythm, develops new atrial fibrillation during the ED workup, and is then admitted as an inpatient for rate control and medical necessity of hospital care. The atrial fibrillation began “in the hospital building,” but it began before the inpatient order. POA = Y.

Example N. The same patient is admitted in sinus rhythm. On hospital day 2, after the inpatient order, new atrial fibrillation appears. POA = N.

Chronic and congenital conditions are generally Y when they exist at admission, even if they are first diagnosed after arrival, when the clinical evidence shows they were already present (for example, a mass known on admission whose biopsy after admission confirms malignancy; the cancer was present on admission). Timing of the lab or pathology report is not the same as timing of the condition.

POA is reported on diagnoses, not on a vibe about whether the hospital “caused” the stay. Almost every non-exempt diagnosis on the inpatient claim gets a POA value. CMS publishes a POA-exempt list (reported as 1 / unreported-not-used on electronic claims). Exempt codes are a reporting technicality; they are not a fifth clinical opinion about whether the patient was sick on arrival. This section focuses on Y / N / U / W, which is what CCDS items test.

The four clinical reporting values

Memorize the U versus W distinction; CCDS items exist to invert it.

U = the chart cannot support a determination. Nobody documented onset well enough. There is no adequate admission skin assessment, the first mention of a pressure injury is on day 2, and no provider has stated whether it was present on admission. U is a documentation failure value, not a clinical shrug. Best practice is to query for POA before assigning U. Under the 2026 ACDIS/AHIMA query guidance, a yes/no POA query is allowed because it does not introduce a new diagnosis, and it must include unable to determine. If the provider then answers unable to determine, that is a path toward W, not an automatic U. If the provider never answers and the record remains silent, U may be what coding is left with—and U has payment teeth on HACs.

W = the provider cannot tell clinically. The onset is genuinely unknowable from a clinical standpoint, and the provider says so. Found down at home, chemical pneumonitis versus community-acquired pneumonia, no reliable history: if the provider documents that it cannot be determined whether the pneumonia was present on admission, W is the correct indicator. W is not a substitute for missing notes. CDI should not assign W because the H&P is blank; W requires a clinical undetermined statement.

Do not interchange U and W. U punishes missing documentation (for HAC payment, like N). W preserves payment treatment like Y when the clinician cannot determine POA. Assigning W to hide a missing skin exam is incorrect. Assigning U when the provider explicitly cannot determine POA is also incorrect.

Assignment patterns worth drilling

• Pressure injury. Present on the admission skin exam = Y. Clearly absent on a complete admission exam and then Stage 3 on day 6 = N. Never examined, first described late, query unanswered = risk of U. Provider documents inability to determine whether a deep-tissue injury started before arrival = W.
• Catheter-associated urinary tract infection (CAUTI) / vascular catheter infection. Infection clearly incubating or present at the order = Y. Infection that meets onset after a device placed following admission = typically N. These categories matter because they appear on the CMS HAC list.
• Falls and trauma in house. Injury that occurred after the inpatient order = N. Injury that occurred in the ED before the order = Y even though it happened on campus.
• Acute conditions diagnosed later but present earlier. Troponin and catheterization on day 1 confirm NSTEMI that began with the presenting chest pain in the ED = Y. Perioperative NSTEMI after an inpatient operation, not present at the order = N.

Combination codes can include a condition that was POA and a complication that was not. Follow Official Guidelines and CMS POA instructions for combination codes rather than inventing a blended indicator: if any part of the combination was not POA, the guidance may require N (do not invent a special house rule; apply the published combination-code POA instruction).

Payment impact: HAC payment provision, not HACRP

CMS operates two different HAC policies. CCDS Domain VI cares that you can assign POA. Domain VIII covers quality programs. This section’s payment point is the IPPS HAC payment provision (sometimes called the HAC-POA provision): selected hospital-acquired condition categories, if they are the CC or MCC that would otherwise split the MS-DRG, do not produce that split when POA is N or U. The case groups as if that HAC were not a CC/MCC. If POA is Y or W, the HAC is allowed to act as a CC/MCC for that grouping step.

N and U generally strip CC/MCC. W is paid like Y. That sentence is the exam-critical payment rule. It is not “any hospital problem loses payment.” It is not “U is paid like W.” It applies to diagnoses in the CMS HAC categories when they would have been the CC/MCC. Other CCs/MCCs that are not HACs still split the DRG according to ordinary grouping, including hospital-onset conditions that are not on the HAC list.

CMS HAC-POA categories (do not confuse with PSI-90 or NHSN measures) include: retained foreign object; air embolism; blood incompatibility; Stage III/IV pressure ulcers; falls and trauma (fractures, dislocations, intracranial injury, crushing, burns, other); manifestations of poor glycemic control; CAUTI; vascular catheter-associated infection; surgical site infection (SSI) mediastinitis after coronary artery bypass grafting; SSI after bariatric surgery; SSI after certain orthopedic procedures (spine, neck, shoulder, elbow); SSI after cardiac implantable electronic device; deep vein thrombosis/pulmonary embolism after total knee or hip replacement; and iatrogenic pneumothorax with venous catheterization.

Worked payment contrast. Stage IV pressure ulcer is an MCC-eligible diagnosis in many MS-DRG families. If it is POA = Y, it can split the DRG (subject to CC exclusions and other grouper logic). If it is POA = N or U, the HAC payment provision generally prevents that MCC from splitting payment. If the provider documents that POA cannot be determined clinically (W), payment treatment follows Y, not N.

Do not merge with the HAC Reduction Program

The Hospital-Acquired Condition Reduction Program (HACRP) is a separate CMS quality program. Hospitals in the worst quartile of Total HAC Score (CMS PSI 90 composite plus specified National Healthcare Safety Network healthcare-associated infection measures: CLABSI, CAUTI, colon and abdominal hysterectomy SSI, MRSA bacteremia, Clostridioides difficile) receive a 1 percent payment reduction. HACRP does not reassign the MS-DRG on the individual claim by reading POA N versus Y. The HAC payment provision is the claim-level CC/MCC neutralization rule tied to POA on HAC category diagnoses.

Mixing the two produces wrong answers: “POA N triggers a 1 percent hospital penalty” is false. “HACRP strips the MCC off this claim” is false. Teach both; never merge them. Chapter 17 continues HAC category detail; Chapter 21 covers HACRP, PSI-90, and related quality programs. This section only needs you to keep the payment provision tied to Y/N/U/W and to leave HACRP in its own box.

CDI practice implications

• Query for POA when timing is unclear before accepting U, using a yes/no format that includes unable to determine.
• Do not query in a way that coaches “please say this was POA so we keep the MCC.” That is leading and reimbursement-directed.
• Capture admission skin exams, device insertion dates, and ED onset in the record so Y versus N is evidence-based.
• Remember ED/obs/outpatient-surgery onset is Y; that single rule prevents a common N over-assignment.
• When discussing working DRGs concurrently, a HAC with expected N should not be counted as if it will split the MS-DRG under the payment provision.

POA assignment is a documentation and classification skill with a defined payment consequence on HAC diagnoses. Get the timestamp (inpatient order), get U versus W right, and keep the HAC payment provision distinct from the HAC Reduction Program.