# Can I take the CKD stage from the eGFR?

Source: https://neurona28.com/blog/ckd-stage-from-provider-not-egfr/  
By Neurona 28 · November 1, 2026 · Topic: Kidney disease

## TL;DR

No. The stage of chronic kidney disease comes from the provider's documentation, not from the
eGFR. In the note below the provider wrote "stage 3a", so CKD stage 3a (N18.31) is supported, with
hypertensive chronic kidney disease (I12.9) because hypertension is documented too. The eGFR agrees
with the provider here, but it is not the basis for the code.

## The note

> A/P: 1) Chronic kidney disease stage 3a, stable. eGFR 51, unchanged since March. Continue
> lisinopril; avoid NSAIDs; repeat kidney function in 6 months. 2) Hypertension, controlled,
> 128/78.

## The stage comes from the words

The guidelines are direct: a diagnosis code is assigned from the provider's diagnostic statement
that the condition exists, not from the clinical criteria behind it. A lab value is a clinical
criterion. The provider wrote "stage 3a", and that sentence is what supports N18.31.

The trap is that the eGFR of 51 agrees. A review that stages from the lab gets this chart right by
accident, and the first chart where the lab and the provider disagree, wrong.

## Hypertension changes the code set

When a patient has both hypertension and chronic kidney disease, ICD-10-CM presumes they are
related and assigns a code from category I12, unless the provider says the kidney disease is not
related to the hypertension. The N18 code is added to identify the stage. Here that is I12.9, which
covers stages 1 through 4, with N18.31 for the stage.

## It was managed at this visit

A condition is reported when it affects care at the encounter. This one did: kidney function was
trended, lisinopril continued, NSAIDs avoided, a repeat test planned.

## When no stage is written

Do not supply one from the eGFR. Query the provider. Put the clinical indicators in the query, as
found and with where they were found (the eGFR values and their dates, the creatinine). Offer only
the stages those indicators support, never the whole list: an option the record gives no reason for
does not belong. Always add "Other, please specify" so the provider can give a different answer, and
"unable to determine" when it fits.

Never write a stage next to a value. "eGFR 34, please confirm stage 3b" answers the question for the
provider. A neutral staging table, such as KDIGO's, may appear in the query if it is cited and
nothing in it is highlighted.

## Sources

- ICD-10-CM Official Guidelines, Section I.A.19, Code assignment and clinical criteria
- ICD-10-CM Official Guidelines, Section I.C.9.a.2, Hypertensive chronic kidney disease
- ICD-10-CM Official Guidelines, Section I.C.14.a, Stages of chronic kidney disease
- ICD-10-CM Official Guidelines, Section IV.J, Code all documented conditions that coexist
- AHIMA and ACDIS, Guidelines for Achieving a Compliant Query Practice (2026 update): clinical
  indicators, answer options, staging criteria in query templates

## FAQ

**The eGFR and the documented stage disagree. Which one do I code?**
The documented stage. If the record is in conflict, query the provider; do not resolve it from the
lab.

---

Educational. It explains the guidelines; it is not a coding decision for a specific chart. Do not paste patient information into any AI tool.