When high blood pressure occurs without a known cause or in relation to another medical condition (e.g., chronic kidney disease) it is known as essential or primary hypertension. Sometimes there are no symptoms. Over time, the long-term force of blood against artery and vessel walls can cause a variety of health problems. In ICD-10-CM, hypertension code options do not distinguish between malignant and benign or between controlled and uncontrolled as they did in ICD-9-CM. What is important for code selection is knowing if the hypertension is caused by or related to another condition. The following helpful table shows some of these options.
I10 if there are no associated causal relationships (e.g., heart disease)
w/ cardiorenal disease
I13.-: this combination code includes hypertension, heart disease, and CKD.
If there is heart failure, use additional code from category I50.-
Do not use with codes from categories I11.- and I12.-.
Note: If there is acute renal failure, add that code.
w/ chronic kidney disease
Patient has CKD classifiable with N18.-
I12.-: this combination code includes hypertension and CKD
N18.- is sequenced first, followed by I12.-
if there is also kidney involvement, see cardiorenal.
Note: If there is acute renal failure, add that code
w/ eye involvement
Report a code from subcategory H35.0- and a code from I10-I15. Sequence according to the reason for the encounter.
w/ heart disease
Patient has heart condition classified with I50.- or I51.4-I51.9
hypertension is related: use code from category I11.-
hypertension is unrelated: sequence according to reason for the encounter
Note: If there is also kidney involvement, use cardiorenal codes instead.
w/ kidney involvement
Hypertensive renal disease NOS or CKD stages 1-4 use code I12.9. Otherwise,see cardiorenal disease codes.
Note: If there is also heart involvement, use cardiorenal codes instead.
pre-existing: see O10.- and O11.-
pregnancy-induced: see O13.-, O14.-, O16.-
w/ pulmonary involvement
pulmonary hypertension: use code from I27.-
secondary pulmonary hypertension (I27.1, I27.2-), code also any associated conditions or adverse effects of drugs or toxins
sequence according to reason for the encounter, except for adverse effects of drugs (See Section I.C.19.e.)
Code first applicable code from categories I60-I69, then report applicable hypertension code.
Blood pressure is 180/120 or greater. Use code from I16.-
Code also any identified hypertensive disease (I10-I15)
Sequence according to reason for the encounter.
Secondary: Hypertension is due to underlying condition not otherwise classified. Two codes are required: one to identify the underlying etiology and one from category I15- to identify the hypertension. Sequence according to reason for the encounter.
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