What is the ICD-10 code for elevated BUN?

The ICD-10 code for elevated BUN without a specific diagnosis is R79.9. Use this code when elevated BUN is noted without an underlying condition like CKD or dehydration.

When should R79.9 be used for elevated BUN?

Use R79.9 for elevated BUN when no specific diagnosis such as CKD or dehydration is documented. Ensure repeat BUN levels are recorded.

ICD-10 Coding for Elevated BUN(R79.9, E86.0, E87.0)

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Learn about the ICD-10 coding for elevated BUN, including code R79.9, documentation requirements, and common coding pitfalls.

Also known as:

High Blood Urea NitrogenIncreased BUN

Related ICD-10 Code Ranges

Complete code families applicable to Elevated BUN

R00-R99Primary Range

Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified

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Code Comparison: When to Use Each Code

Compare key differences between these codes to ensure accurate selection

Code	Description	When to Use	Key Documentation
R79.9	Abnormal findings of blood chemistry, unspecified	Use when elevated BUN is noted without a specific underlying diagnosis.	BUN >20 mg/dL on ≥2 tests No documented CKD AKI or dehydration
N18.3	Chronic kidney disease, stage 3	Use when CKD stage 3 is documented with elevated BUN.	eGFR 30-59 for ≥3 months Documented CKD stage
E86.0	Dehydration	Use when dehydration is the cause of elevated BUN.	BUN:Cr ratio >20:1 Clinical signs of dehydration

Primary ICD-10-CM Codes

Abnormal finding of blood chemistry, unspecified

R79.9Billable

Differential Codes

Alternative codes to consider when ruling out similar conditions

Chronic kidney disease, stage 3N18.3

Use when BUN >30 mg/dL with eGFR 30-59 for ≥3 months.

DehydrationE86.0

Use when BUN:Cr ratio >20:1 with clinical signs of dehydration.

Abnormal findings of blood chemistry, unspecifiedR79.9

Documentation & Coding Risks

Avoid these common issues when documenting Elevated BUN.

Failing to document repeat elevated BUN levels.

Impact

Clinical: May lead to misdiagnosis or inappropriate treatment., Regulatory: Non-compliance with coding standards., Financial: Potential claim denials due to insufficient documentation.

Mitigation

Ensure repeat tests are documented., Include clinical context for elevated levels.

Using R79.9 when a specific diagnosis exists

Impact

Reimbursement: May lead to claim denials if incorrect code is used., Compliance: Non-compliance with coding guidelines., Data Quality: Inaccurate data representation in patient records.

Mitigation

Use the specific diagnosis code instead of R79.9.

Incorrect Code Usage

Impact

Using R79.9 when a specific diagnosis is documented.

Mitigation

Ensure thorough review of patient records for specific diagnoses.

Frequently Asked Questions

Documentation requirements, coding pitfalls and FAQs for conditions coded with R79.9.

Primary Code

R79.9

Abnormal finding of blood chemistry, unspecified

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ICD-10 codes6

Coding risks3

FAQs2

ICD-10 Coding for Elevated BUN(R79.9, E86.0, E87.0)

Documentation & Coding Risks

Frequently Asked Questions

What is the ICD-10 code for elevated BUN?

When should R79.9 be used for elevated BUN?

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