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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Ximena Kestrel: Chronic kidney disease

ENC-00152 · 61M · Cardiology · admitted Sat Nov 07, 2026 08:24 AM · discharged Thu Nov 12, 2026 02:54 PM · attending Dr. Wes Merriweather

Specificity gap Criteria met Open

Documented “CKD” (N18.9); criteria support the more specific Chronic kidney disease stage 4 (N18.4).

Documented vs supported

Documented: “CKD” · N18.9 Chronic kidney disease, unspecified
Criteria support: Chronic kidney disease stage 4 · N18.4 Chronic kidney disease, stage 4 (severe)
Outcome: Two eGFR values >=90 days apart; staging value 18.4 (G4)
Rule: Chronic kidney disease stage (eGFR, CKD-EPI 2021) v2026.11-1
Published source: KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease (2024), Chapter 1, Table 1 (definition: abnormality for a minimum of 3 months) and Table 2 (GFR categories) · source (checked 2026-11-14)

Effect if the clinician agrees (illustrative)

Change: N18.9 -> N18.4
Secondary-diagnosis level: non-CC → CC
MS-DRG (illustrative): 291 Heart failure and shock with MCC → 291 Heart failure and shock with MCC
Relative weight: 1.2838 → 1.2838 (+0.0000)
Codes before: I50.31, E66.811, N18.9, N17.9, E87.1, L89.154
Codes after: I50.31, E66.811, N17.9, E87.1, L89.154, N18.4

All open gaps on this encounter together: MS-DRG 291 → 291 (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

0.5 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
Number of pre-admission eGFR values within 2 years (inpatient values during acute illness are not used)	2	creatinine 3.64 -> eGFR 18 · lab LAB-005215 · 2025-10-22 09:15 creatinine 3.6 -> eGFR 18 · lab LAB-005216 · 2026-09-17 10:05
Days between the earliest and latest pre-admission eGFR values	330	creatinine 3.64 mg/dL -> eGFR 18 (CKD-EPI 2021) · lab LAB-005215 · 2025-10-22 09:15 creatinine 3.6 mg/dL -> eGFR 18 (CKD-EPI 2021) · lab LAB-005216 · 2026-09-17 10:05
Earliest pre-admission eGFR (mL/min/1.73 m2, CKD-EPI 2021)	18.2	creatinine 3.64 mg/dL -> eGFR 18 (CKD-EPI 2021) · lab LAB-005215 · 2025-10-22 09:15
Latest pre-admission eGFR (mL/min/1.73 m2, CKD-EPI 2021)	18.4	creatinine 3.6 mg/dL -> eGFR 18 (CKD-EPI 2021) · lab LAB-005216 · 2026-09-17 10:05

Rule trace (inputs, thresholds, outcome)

Rule trace (rule ckd v2026.11-1; evaluated in order, first true outcome wins; "unknown" = missing input)
Step	Expression	Inputs and thresholds read	Result
derived: chronic	`egfr_n >= 2 and egfr_span_days >= t.chronic_days`	egfr_n=2, egfr_span_days=330, t.chronic_days=90	true
derived: staging_egfr	`max(egfr_early, egfr_late)`	egfr_early=18.2, egfr_late=18.4	18.4
derived: both_below_60	`egfr_early < t.g2 and egfr_late < t.g2`	egfr_early=18.2, egfr_late=18.4, t.g2=60	true
derived: category	`case(staging_egfr >= t.g2, 'G1-G2', staging_egfr >= t.g3a, 'G3a', staging_egfr >= t.g3b, 'G3b', staging_egfr >= t.g4, 'G4', 'G5')`	staging_egfr=18.4, t.g2=60, t.g3a=45, t.g3b=30, t.g4=15	G4
outcome: duration_not_shown	`not chronic`	chronic=True	false
outcome: straddles_60	`not both_below_60 and min(egfr_early, egfr_late) < t.g2`	both_below_60=True, egfr_early=18.2, egfr_late=18.4, t.g2=60	false
outcome: g1_g2	`staging_egfr >= t.g2`	staging_egfr=18.4, t.g2=60	false
outcome: g3a	`category == 'G3a'`	category=G4	false
outcome: g3b	`category == 'G3b'`	category=G4	false
outcome: g4	`category == 'G4'`	category=G4	true

Documentation query

Title and question drafted by model clockworks-mock (audit entry #2259); clinical indicators and answer options assembled by code from the rule and the record.

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DOCUMENTATION QUERY (draft)
Title: Clarification request: chronic kidney documentation
Encounter: ENC-00152   Patient: Ximena Kestrel   To: Dr. Wes Merriweather

Clinical indicators from the health record:
- Documented in the record: "CKD" [History and physical DOC-000515]
- creatinine 3.64 -> eGFR 18 (2025-10-22 09:15) [lab LAB-005215]
- creatinine 3.6 -> eGFR 18 (2026-09-17 10:05) [lab LAB-005216]

Question:
Based on your clinical judgement and the indicators above, can the chronic kidney condition be further specified, including stage if known?

Response options (select one or write your own):
( ) Chronic kidney disease stage 3b (eGFR 30-44)
( ) Chronic kidney disease stage 4 (eGFR 15-29)
( ) 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

Acute kidney injury · Clinical validation gap Documented “acute kidney injury” (N17.9) but the criteria are not met: KDIGO creatinine and urine-output criteria not met.
Hyponatraemia · Clinical validation gap Documented “hyponatremia” (E87.1) but the criteria are not met: All sodium values 135 or above (lowest 138).

History

Audit entries for this finding (newest first)
Seq	When (UTC)	Actor	Action	Entities	Decision / reason	Model / hashes
2259	2026-11-14T20:57:26	system:llm system	`llm.call`	ENC-00152, ENC-00152.ckd	—	clockworks-mock mock-1/exactdx.draft_query@1 prompt 23057ac6e924 output bf34b17a9932 entry 0ae4ced9ce6c
1433	2026-11-14T19:24:31	system:llm system	`llm.call`	ENC-00152, ENC-00152.ckd	—	clockworks-mock mock-1/exactdx.draft_query@1 prompt 23057ac6e924 output bf34b17a9932 entry 713a1c411435
691	2026-11-14T18:29:06	system:llm system	`llm.call`	ENC-00152, ENC-00152.ckd	—	clockworks-mock mock-1/exactdx.draft_query@1 prompt 23057ac6e924 output bf34b17a9932 entry 547b3c466230