R53.1 – Weakness

The ICD-10-CM code R53.1 designates that a patient has weakness. Learn what this code entails, from its clinical information to related ICD-10 codes.

By Emma Hainsworth on Aug 8, 2025.

Fact Checked by Ericka Pingol.

Use Code

R53.1 Diagnosis Code: Weakness

The R53.1 is an ICD code that’s included in the International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM), and it is used to designate “Weakness.”

Weakness, in the context of this ICD-10 code, means weakness in anything. It can be a weakness in the arms, legs, facial muscles, eyes, etc. Given how general this ICD-10 code is, it is best to use it as a principal diagnosis only when the specific weakness hasn’t been determined.

It is not considered to be valid as a principal diagnosis by the ICD-10 guidelines if you have already determined and established the specific weakness that your patient is experiencing.

Yes, the R53.1 ICD-10 code is billable and can be used to designate a patient for reimbursement purposes.

R53.1 clinical information

As we mentioned earlier, when we speak of weakness in the context of this ICD-10 code, we mean weakness in general. This means this ICD-10 code is meant to be used only as a general diagnosis. In other words, it is used when the specific cause of weakness has not been determined. If you, the healthcare provider, can determine the cause of the weakness, then the ICD-10 guidelines dictate that you use a more specific ICD-10 code instead.

Another way of referring to weakness is Asthenia. This term refers to a patient feeling physical weakness and lacking the energy to do anything. This shouldn’t be viewed as a specific disease, by the way. It’s best to look at it as the result of certain factors and conditions because it can be caused by a number of reasons, like the intake of certain medicines, neurological conditions, aging, and more.

The treatment for weakness will depend on what’s causing it. Some might just need to take certain medications, some might require antibiotics, and some might require physical therapy. Some may just need to rest for a while, and they will be fine. If a person frequently has bouts with weakness/asthenia, then it’s recommended that they see a doctor because they might be dealing with a problem they aren’t even aware of.

R53.1 synonyms include

Asthenia
Asthenia due to disease
Attacks of weakness
Focal motor weakness
Weakness as a late effect of stroke

Other ICD-10 codes commonly used for weakness and related problems:

R53 - Malaise and fatigue
R53.0 - Neoplastic (malignant) related fatigue
R53.2 - Functional quadriplegia
R53.8 - Other malaise and fatigue
R53.81 - Other malaise
R53.82 - Chronic fatigue, unspecified
R53.83 - Other fatigue

Commonly asked questions

Yes, this ICD-10 code is billable.

You use it when your patient is confirmed to be feeling weakness. The cause at the time of usage is not known, but if the healthcare provider can determine the specific cause/problem, they need to designate a more specific and appropriate ICD-10 code.

That depends on the specific problem causing the weakness. They may need physical therapy, antibiotics, etc.

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