Study guide
17.1 Present on Admission Clarification and Selected HAC Rules
AHIMA Certified Documentation Integrity Practitioner CDIP
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1 Chapter 1: Authoritative Coding Resources & Conventions
1.1 Official Coding Resources: Scope, Authority & Research 1.2 General Coding Conventions, Punctuation & Instructional Notes 1.3 Chapter-Specific and Setting-Specific Coding Guidelines
2 Chapter 2: Principal & Secondary Diagnosis Determination
2.1 UHDDS Definitions & Principal Diagnosis Selection 2.2 Two or More Diagnoses Equally Meeting Criteria 2.3 Secondary Diagnosis Reporting Standards & POA Status
3 Chapter 3: Procedure Coding & Sequencing Standards
3.1 ICD-10-PCS Root Operations & Inpatient Procedure Coding 3.2 Principal Procedure Selection & Surgical Sequencing 3.3 Applying Official References to Ambiguous Records
4 Chapter 4: Inpatient Prospective Payment & DRG Grouping
4.1 MS-DRG Logic, CC/MCC Exclusions & Severity Levels 4.2 Working vs. Final DRG Assignment & Optimization vs. Maximization 4.3 CDI-Coding Reconciliation & Annual Regulatory Updates
5 Chapter 5: Enterprise CDI Promotion & Program Value
5.1 Articulating CDI Value to C-Suite & Hospital Leadership 5.2 Organizational Models, Inpatient/Outpatient Scope & Staffing 5.3 Cross-Functional Collaboration: HIM, Quality & Case Management
6 Chapter 6: Cross-Functional Alignment & Improvement Projects
6.1 Partnering with Nursing, Pharmacy & Allied Health Professionals 6.2 Documentation Improvement Project Identification & Scoping 6.3 Executing, Piloting & Measuring CDI Project Outcomes
7 Chapter 7: Physician Champion Engagement & Clinical Advocacy
7.1 Selection, Role & Credibility of the CDI Physician Champion 7.2 Peer-to-Peer Engagement, Coaching & Overcoming Resistance 7.3 Developing Standard CDI Operational Policies & Procedures
8 Chapter 8: Compliant Policy Architecture & Query Governance
8.1 AHIMA/ACDIS Practice Brief Standards in Policy Construction 8.2 Medical Record Integration of Provider Query Responses 8.3 Policies for Electronic, Paper, and Verbal Query Communications
9 Chapter 9: Query Escalation & Professional Communication
9.1 Chain of Command & Protocols for Unanswered Queries 9.2 Conflict Resolution & Professional Feedback Mechanisms 9.3 Assessing Stakeholder Learning Needs & Specialty Curricula
10 Chapter 10: Educational Delivery & Broader Healthcare Impacts
10.1 Delivery Methods: Microlearning, Case Studies & Grand Rounds 10.2 Documentation Impacts on Clinical Research & Epidemiology 10.3 Documentation Impacts on Case Management, LOS & Reimbursement
11 Chapter 11: Clinical Record Synthesis & Encounter Trajectory
11.1 Synthesizing Provider Notes, Consults & Progress Trajectory 11.2 Interpreting Diagnostic Imaging, Pathology & Labs 11.3 Resolving Conflicting, Ambiguous & Copy-Forward Entries
12 Chapter 12: Advanced Clinical Concepts & Review Prioritization
12.1 Pharmacotherapy, Clinical Trajectories & Disease Correlations 12.2 Inpatient Review Prioritization: High-Risk & High-Volume 12.3 Payer Prioritization, Length of Stay & Re-Review Cadence
13 Chapter 13: Clinical Indicator Mapping & Gap Recognition
13.1 Systematic Identification of Documentation Gaps 13.2 Sepsis Definitions, SEP-1, and Coding 13.3 AKI Criteria, Tubular Injury, and CKD Staging
14 Chapter 14: Diagnostic Precision in High-Impact Conditions
14.1 Respiratory Failure: Acuity, Evidence, and Sequencing 14.2 Heart Failure Phenotype, Acuity, and Hypertensive Combinations 14.3 Encephalopathy, Delirium, and Acute Cognitive Change
15 Chapter 15: Clinical Validation & Complication Discrepancies
15.1 Malnutrition Assessment, Severity, and Provider Documentation 15.2 Principles of a Compliant, Nonleading Query 15.3 Open-Ended, Multiple-Choice, and Yes/No Queries
16 Chapter 16: Query Mechanics & Direct Provider Collaboration
16.1 Electronic Query Systems, Templates, and Technology Oversight 16.2 Collaborating With the Appropriate Query Recipient 16.3 Capturing and Clarifying Query Responses
17 Chapter 17: Quality Indicators & Post-Discharge Clarification
17.1 Present on Admission Clarification and Selected HAC Rules 17.2 Clarifying Acuity, Cause, Site and Severity 17.3 Post-Discharge Query Opportunities and Limits 17.4 Managing Post-Discharge Query Workflows
18 Chapter 18: CDI Operational Dashboards & Quality Auditing
18.1 Departmental Metrics: Definitions, Calculations and Dashboard Use 18.2 Internal CDI Quality Audits and Reviewer Calibration 18.3 Query Trends: Understanding the Process and Provider Experience
19 Chapter 19: Benchmarking, Productivity & Data-Driven Workflow
19.1 Provider Documentation Benchmarking 19.2 External Benchmarking: CMI, Severity, Mortality and Length of Stay 19.3 Evaluating CDI Professional Performance 19.4 Using Data to Design CDI Workflow and Staffing
20 Chapter 20: Ethical CDI Standards & Regulatory Frameworks
20.1 Applying AHIMA Ethics to CDI Decisions 20.2 Responding to Financial Pressure and Upcoding Risks 20.3 Maintaining Competence and Professional Integrity
21 Chapter 21: Regulatory Compliance & Enforcement Landscapes
21.1 False Claims, Overpayments and Referral Laws 21.2 Regulatory Agencies, Review Contractors and Appeals 21.3 EHR Templates, Copied Text and Record Integrity
22 Chapter 22: Technology Risks & Second-Level Review Protocols
22.1 CAC, NLP and AI: Context, Oversight and Performance 22.2 Selecting Cases for Second-Level Review 22.3 Conducting and Closing a Second-Level Review
23 Chapter 23: Clinical Validation Queries & Risk Mitigation
23.1 Clinical Validation and Coding Clarification 23.2 Clinical Validation Queries and Denial Evidence 23.3 Detecting Leading, Biased and Unsupported Queries
24 Chapter 24: Noncompliant Query Remediation & Query Lifecycle Management
24.1 Query Remediation and Corrective Action 24.2 Query Timeframes, Aging and Measurement 24.3 Query Records, Retention and Evidence Preservation
17.1 Present on Admission Clarification and Selected HAC Rules
Key Takeaways Explain This Topic AI
Determine reportable diagnoses first, then assign POA using the inpatient admission order as the timing reference; earlier emergency, observation or outpatient-surgery conditions may be POA Y.
Distinguish U for insufficient documentation from W for clinical inability to determine timing, and use the applicable annual exemption and claim-reporting instructions.
For a code containing multiple clinical concepts, the general rule is N when a represented concept was not present on admission, with specific instructions such as infection/organism timing applied.
Final v44 lists stage 3/4 sacral pressure-ulcer codes as MCC/selected HACs, but L89.150 unstageable is neither listed as a CC/MCC in Appendix C Part 1 nor included in HAC 04.
A selected-HAC N/U payment exclusion does not guarantee a lower DRG, and a POA indicator alone does not establish a HACRP measure event or hospital-level penalty.
Last updated: October 2026
Present on Admission Clarification and Selected HAC Rules
Present on admission (POA) reporting describes the timing of a condition represented by an assigned diagnosis code. It does not decide whether the condition should be coded in the first place. Establish the reportable diagnoses under the applicable coding rules, then apply the FY2027 POA guidelines in Appendix I . Keep clinical onset, diagnosis date, code assignment, and payment or quality-program effects distinct.
Use the inpatient admission order as the reference point
POA means present when the order for inpatient admission occurs. A condition developing during an earlier emergency, outpatient surgery, or observation encounter is considered present on admission to the subsequent inpatient stay. It can have arisen in the hospital building and still be POA for that inpatient claim.
Hypothetical timeline: Observation begins Monday at 08:00. A provider establishes a new condition on Tuesday at 20:00, 36 hours later. The inpatient admission order occurs Wednesday at 08:00, 48 hours after presentation. If the condition is reportable and was present before that order, its POA indicator is Y. Do not use the patient's first arrival time or a 24-hour threshold to change that conclusion.
The date a diagnosis is first written does not necessarily establish onset. Appendix I sets no universal deadline by which a provider must identify a POA condition. A diagnosis recognized several days later may have been present at admission. Link the later diagnosis to the earlier findings through the applicable guidance and provider judgment; do not independently assign a diagnosis from those findings.
Distinguish the reporting options
- Option Meaning Important boundary
- Y Present at inpatient admission Not proof that the condition originated outside the hospital
- N Not present at inpatient admission Not automatically a selected payment HAC or a quality-measure event
U Documentation is insufficient to determine timing Not equivalent to a provider's clinical inability to determine timing
W Provider cannot clinically determine whether it was present Does not mean every inadequately documented case can be labeled W
Exempt/unreported Code is exempt from POA reporting Use the applicable annual exempt list and current reporting instructions
U should be used only in limited circumstances; clarify unclear documentation when appropriate. W reflects a documented clinical determination that the timing cannot be established. Do not choose between them based on which payment outcome is more favorable.
The FY2027 guidelines instruct leaving the POA field blank for an exempt code. The CMS coding webpage also describes the historical “1” convention for 4010A electronic submission. That historical explanation is not permission to invent E as a national transmitted POA indicator. Consult the applicable claim instructions and the FY2027 exempt list . For example, Z87.891 is on that list; L89.150 is not.
POA reporting requirements apply to inpatient claims subject to the relevant laws and regulations. They include reportable principal and secondary diagnoses and applicable external-cause codes, with exemptions. They should not be described as an unqualified requirement for every diagnosis on every inpatient claim regardless of facility, payer, or exemption.
Apply the combination-code rule correctly
For a code containing multiple clinical concepts, Appendix I generally assigns N if at least one represented concept was not present on admission and Y if all were present. A chronic component alone does not make a later acute exacerbation POA Y.
For example, if chronic systolic heart failure was present at admission but an acute exacerbation first developed during the inpatient stay, the combined acute-on-chronic code I50.23 is POA N under this rule. Do not assign a different code merely to obtain Y. If separate codes appropriately represent separate conditions, assess their timing separately under the classification and applicable guidelines.
There are specific instructions to apply rather than an unrestricted slogan. For an infection code that includes its causal organism, assign Y when the infection or its signs were present at admission even if the culture result identifying the organism became available later. A result date is not automatically an onset date.
A diagnosis subsequently confirmed after admission can also be POA when appropriately suspected at admission or established as the cause of an admission symptom. For an uncertain diagnosis at discharge, apply the specified inpatient uncertain-diagnosis rules first and then the POA instructions based on the relevant admission findings. An early suspected condition that was ultimately ruled out does not become reportable merely because it appeared in the admission differential.
Check selected HAC membership and the whole case
The CMS selected-HAC payment provision arises from DRA section 5001(c). For the selected secondary diagnoses that meet the applicable criteria, N or U prevents additional payment attributable to that HAC; Y or W does not trigger that exclusion. This is not a promise of a higher DRG for every Y/W diagnosis or an automatic lower DRG for every N/U diagnosis. Other diagnoses, exclusions, procedures, and grouping logic can leave the result unchanged.
Use the exact annual diagnosis and, where required, procedure criteria in the final v44 definitions manual, Appendix I . CMS identifies 14 categories, including retained foreign object, air embolism, blood incompatibility, stage III/IV pressure ulcers, falls and trauma, specified glycemic-control manifestations, catheter-associated urinary or vascular infections, specified surgical-site infections, DVT/PE with specified hip or knee replacement, and pneumothorax with venous catheterization. Category names alone do not establish whether an individual code combination qualifies.
Example requiring exact classification Final v44 finding Review implication
L89.153 or L89.154 Sacral pressure ulcer stage 3 or 4; MCC and listed in HAC 04 Apply actual stage, timing, and grouping criteria
L89.150 Sacral pressure ulcer, unstageable; not listed as a CC/MCC in Appendix C Part 1 and not in HAC 04 Do not apply the selected stage III/IV payment rule simply because the ulcer is unstageable
T80.211A Central venous catheter bloodstream infection; CC and listed in HAC 07 Do not describe it as an MCC or substitute a surveillance definition for the code's requirements
Specified postoperative infection or DVT/PE Some categories require particular procedure codes Do not treat every postoperative infection or every embolism as a selected HAC
Use actual code titles. E11.00 describes type 2 diabetes with hyperosmolarity without coma; E11.01 is the corresponding with-coma code. E16.0 is drug-induced hypoglycemia without coma and is not the selected hypoglycemic-coma entry. These distinctions cannot be repaired by labeling all glycemic complications alike.
Preserve pressure-ulcer distinctions
FY2027 guideline I.C.12.a distinguishes an unstageable ulcer from an unspecified stage. If debridement reveals the stage of an unstageable ulcer, assign the revealed-stage code as directed. If an ulcer truly progresses from one stage at admission to a higher stage during the stay, assign the two site/stage codes required by the guideline. Revealing a previously obscured stage and clinical progression are different situations.
Review the actual diagnosis, permitted stage documentation, and chronology. A nursing assessment can support stage documentation under I.B.14; the associated pressure-ulcer diagnosis still requires the appropriate provider documentation. A skin finding within 12 or 24 hours is evidence to evaluate, not a universal POA proof rule. Do not invent an admission stage from the eventual severity.
Ask a neutral timing question when needed
Suppose the inpatient order is Monday at 14:00, a wound assessment at 16:00 documents a stage 3 sacral pressure ulcer, and the involved provider confirms that diagnosis the next morning. Earlier documentation leaves timing unclear. A POA query should cite those sources and ask whether the documented condition was present at the time of the inpatient admission order. Provide Yes, No, and Unable to determine, as required by the 2026 query brief .
Do not redefine Y as “present before arriving at the hospital,” assume that the 16:00 assessment proves onset after 14:00, or mention avoiding a HAC payment effect. Preserve the provider's assessment and apply the actual reporting rules to the response.
Finally, distinguish selected-HAC claim payment from the HAC Reduction Program . HACRP uses specified hospital-level measures and reduces applicable payments by 1% for hospitals in its worst-performing quartile. A single N indicator or selected-HAC code does not automatically establish a measure event or impose that hospital-level reduction. Apply the current measure population, exclusions, definitions, and program rules separately.