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  6. 2024 ICD-10-CM Code M91.1
Version 2024
Non-Billable Code

2024 ICD-10-CM Diagnosis Code M91.1

Juvenile osteochondrosis of head of femur [Legg-Calve-Perthes]

ICD-10-CM Code:
M91.1
ICD-10 Code for:
Juvenile osteochondrosis of head of femur
Is Billable?
Not Valid for Submission
Code Navigator:

Code Classification

  • Diseases of the musculoskeletal system and connective tissue
    (M00–M99)
    • Chondropathies
      (M91-M94)
      • Juvenile osteochondrosis of hip and pelvis
        (M91)

M91.1 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of juvenile osteochondrosis of head of femur [legg-calve-perthes]. The code is not specific and is NOT valid for the year 2024 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Specific Coding Applicable to Juvenile osteochondrosis of head of femur

Non-specific codes like M91.1 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for juvenile osteochondrosis of head of femur:

  • Use M91.10 for Juvenile osteochondrosis of head of femur [Legg-Calve-Perthes], unspecified leg - BILLABLE CODE

  • Use M91.11 for Juvenile osteochondrosis of head of femur [Legg-Calve-Perthes], right leg - BILLABLE CODE

  • Use M91.12 for Juvenile osteochondrosis of head of femur [Legg-Calve-Perthes], left leg - BILLABLE CODE

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

Patient Education


Hip Injuries and Disorders

Your hip is the joint where your femur (thigh bone) meets your pelvis (hip bone). There are two main parts: a ball at the end of the femur, which fits in a socket in the pelvis. Your hip is known as a ball-and-socket joint. This is because you have a ball at the end of your femur, and it fits into a socket in your pelvis. This makes your hips very stable and allows for a wide range of motion. When they are healthy, it takes great force to hurt them. However, playing sports, running, overuse, or falling can sometimes lead to hip injuries such as:

  • Strains
  • Bursitis
  • Dislocations
  • Fractures (broken bones)

Certain diseases also lead to hip injuries or problems. Osteoarthritis can cause pain and limited motion. Osteoporosis of the hip causes weak bones that break easily. Both of these are common in older people.

Another problem is hip dysplasia, where the ball at the end of the femur is loose in the hip socket. It can cause hip dislocation. Babies who have hip dysplasia are usually born with it, but sometimes they develop it later.

Treatment for hip disorders may include rest, medicines, physical therapy, or surgery, including hip replacement.


[Learn More in MedlinePlus]

Legg-Calvé-Perthes disease

Legg-Calvé-Perthes disease is a bone disorder that affects the hips. Usually, only one hip is involved, but in about 10 percent of cases, both hips are affected. Legg-Calvé-Perthes disease begins in childhood, typically between ages 4 and 8, and affects boys more frequently than girls.

In this condition, the upper end of the thigh bone, known as the femoral head, breaks down. As a result, the femoral head is no longer round and does not move easily in the hip socket, which leads to hip pain, limping, and restricted leg movement. The bone eventually begins to heal itself through a normal process called bone remodeling, by which old bone is removed and new bone is created to replace it. This cycle of breakdown and healing can recur multiple times. Affected individuals are often shorter than their peers due to the bone abnormalities. Many people with Legg-Calvé-Perthes disease go on to develop a painful joint disorder called osteoarthritis in the hips at an early age.


[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.