Extended criteria (experimental). This is the broader ten-condition engine, kept as a secondary area. It shows ICD-10-CM codes and illustrative grouping effects for CDI staff. The primary surface is Before you sign (kidney, measurement only). All extended pages.

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Quinn Northam: Heart failure

ENC-00164 · 79F · Pulmonology · admitted Fri Oct 30, 2026 08:03 AM · discharged Sat Nov 07, 2026 10:10 AM · attending Dr. Kenji Stavros

Specificity gap Criteria met Open

Documented “HFrEF” (I50.20); criteria support the more specific Chronic systolic (HFrEF) heart failure (I50.22).

Documented vs supported

Documented: “HFrEF” · I50.20 Unspecified systolic (congestive) heart failure
Criteria support: Chronic systolic (HFrEF) heart failure · I50.22 Chronic systolic (congestive) heart failure
Outcome: LVEF 22%, prior heart failure, no acute indicators
Rule: Heart failure type (LVEF) and acuity v2026.11-1
Published source: Universal Definition and Classification of Heart Failure (HFSA/HFA/JHFS, 2021), as restated in Chandramouli et al., Clin Cardiol 2022 (2021), LVEF classification: HFrEF <=40%, HFmrEF 41-49%, HFpEF >=50%; HFimpEF = baseline <=40%, rise >=10 points, second LVEF >40% · source (checked 2026-11-14)
Contested: No guideline gives a numeric definition of "acute" versus "chronic" heart failure. This rule uses a LOCAL CONVENTION: at least two acute indicators (IV loop diuretic, elevated natriuretic peptide, new oxygen requirement) = acute; with a prior history of heart failure = acute on chronic; none with history = chronic; exactly one = clinical judgement.

Effect if the clinician agrees (illustrative)

Change: I50.20 -> I50.22
Secondary-diagnosis level: CC → CC
MS-DRG (illustrative): 191 Chronic obstructive pulmonary disease with CC → 191 Chronic obstructive pulmonary disease with CC
Relative weight: 0.8430 → 0.8430 (+0.0000)
Codes before: J44.1, E66.9, I50.20, D64.9, L89.150, E11.9, E78.5
Codes after: J44.1, E66.9, D64.9, L89.150, E11.9, E78.5, I50.22

All open gaps on this encounter together: MS-DRG 191 → 191 (RW +0.0000). The grouping does not change; the record becomes accurate.

CC/MCC status, CC exclusions (subset) and relative weights from the public CMS FY2026 IPPS final rule tables (5, 6I, 6J, 6K). This is not a grouper and not a payment estimate. Queries never mention any of this.

Severity documentation index change SIMULATED

0.0 points

SIMULATED: Illustrative severity weights (MCC = 1.0, CC = 0.5, non-CC = 0) summed over secondary diagnoses; not a validated risk-adjustment model and not a measured effect.

Evidence

Structured values are read by code from the cited rows. Note facts are shown only when the model's quote was found verbatim in the note.

Evidence (each item cited to a source row or a quoted span)
Input	Value	Source
Latest LVEF within 12 months (%)	22.0	echo LVEF 22% · echo ECH-000078 · 2026-10-31 13:03
Highest BNP this stay (pg/mL)	69.0	BNP 69 pg/mL · lab LAB-005603 · 2026-10-30 09:03
Prior heart failure on the problem list / history	True	history: heart failure with reduced ejection fraction · history HX-000059

Rule trace (inputs, thresholds, outcome)

Rule trace (rule heart_failure v2026.11-1; evaluated in order, first true outcome wins; "unknown" = missing input)
Step	Expression	Inputs and thresholds read	Result
derived: np_elevated	`coalesce(bnp_max >= t.bnp, false) or coalesce(ntprobnp_max >= t.ntprobnp, false)`	bnp_max=69.0, ntprobnp_max=unknown, t.bnp=100, t.ntprobnp=300	false
derived: acute_count	`count(iv_loop_diuretic, np_elevated, new_o2)`	iv_loop_diuretic=False, new_o2=False, np_elevated=False	0
derived: hf_type	`case(lvef <= t.ref, 'systolic', lvef >= t.pres, 'diastolic', 'midrange')`	lvef=22.0, t.pres=50, t.ref=40	systolic
derived: improved	`coalesce(lvef_prior_min <= t.ref and lvef > t.ref and lvef - lvef_prior_min >= t.improved_rise, false)`	lvef=22.0, lvef_prior_min=unknown, t.improved_rise=10, t.ref=40	false
derived: acuity	`case(acute_count >= 2 and hf_history, 'acute on chronic', acute_count >= 2, 'acute', acute_count == 0 and hf_history, 'chronic', null)`	acute_count=0, hf_history=True	chronic
outcome: improved_ef	`improved`	improved=False	false
outcome: midrange	`hf_type == 'midrange'`	hf_type=systolic	false
outcome: sys_aoc	`hf_type == 'systolic' and acuity == 'acute on chronic'`	acuity=chronic, hf_type=systolic	false
outcome: sys_acute	`hf_type == 'systolic' and acuity == 'acute'`	acuity=chronic, hf_type=systolic	false
outcome: sys_chronic	`hf_type == 'systolic' and acuity == 'chronic'`	acuity=chronic, hf_type=systolic	true

Documentation query

Title and question drafted by model clockworks-mock (audit entry #2279); clinical indicators and answer options assembled by code from the rule and the record.

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DOCUMENTATION QUERY (draft)
Title: Clarification request: cardiac documentation
Encounter: ENC-00164   Patient: Quinn Northam   To: Dr. Kenji Stavros

Clinical indicators from the health record:
- Documented in the record: "HFrEF" [Progress note DOC-000554]
- echo LVEF 22% (2026-10-31 13:03) [echo ECH-000078]
- BNP 69 pg/mL (2026-10-30 09:03) [lab LAB-005603]
- history: heart failure with reduced ejection fraction [history HX-000059]

Question:
Based on your clinical judgement and the indicators above, can the type and acuity of the heart failure being treated be further specified?

Response options (select one or write your own):
( ) Chronic systolic heart failure (HFrEF)
( ) Acute on chronic systolic heart failure (HFrEF)
( ) Other (please specify): ____________
( ) Unable to determine

Please respond based on your independent clinical judgement. Any response, including "unable to determine", is acceptable. This query and your response are kept as part of the health record.

Other findings on this encounter

Obesity · Specificity gap Documented “obesity” (E66.9); criteria support the more specific Obesity, class 1 (E66.811).

History

Audit entries for this finding (newest first)
Seq	When (UTC)	Actor	Action	Entities	Decision / reason	Model / hashes
2279	2026-11-14T20:57:26	system:llm system	`llm.call`	ENC-00164, ENC-00164.heart_failure	—	clockworks-mock mock-1/exactdx.draft_query@1 prompt 97eeabcf72dd output 752ce96b1cd3 entry fc5758089fe8
1453	2026-11-14T19:24:31	system:llm system	`llm.call`	ENC-00164, ENC-00164.heart_failure	—	clockworks-mock mock-1/exactdx.draft_query@1 prompt 97eeabcf72dd output 752ce96b1cd3 entry cb285d902ca4
711	2026-11-14T18:29:07	system:llm system	`llm.call`	ENC-00164, ENC-00164.heart_failure	—	clockworks-mock mock-1/exactdx.draft_query@1 prompt 97eeabcf72dd output 752ce96b1cd3 entry 1c75458c84de