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  6. 2024 ICD-10-CM Code M61.1
Version 2024
Non-Billable Code

2024 ICD-10-CM Diagnosis Code M61.1

Myositis ossificans progressiva

ICD-10-CM Code:
M61.1
ICD-10 Code for:
Myositis ossificans progressiva
Is Billable?
Not Valid for Submission
Code Navigator:

Code Classification

  • Diseases of the musculoskeletal system and connective tissue
    (M00–M99)
    • Disorders of muscles
      (M60-M63)
      • Calcification and ossification of muscle
        (M61)

M61.1 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of myositis ossificans progressiva. 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 Myositis ossificans progressiva

Non-specific codes like M61.1 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 myositis ossificans progressiva:

  • Use M61.10 for Myositis ossificans progressiva, unspecified site - BILLABLE CODE

  • M61.11 for Myositis ossificans progressiva, shoulder - NON-BILLABLE CODE

  • Use M61.111 for Myositis ossificans progressiva, right shoulder - BILLABLE CODE

  • Use M61.112 for Myositis ossificans progressiva, left shoulder - BILLABLE CODE

  • Use M61.119 for Myositis ossificans progressiva, unspecified shoulder - BILLABLE CODE

  • M61.12 for Myositis ossificans progressiva, upper arm - NON-BILLABLE CODE

  • Use M61.121 for Myositis ossificans progressiva, right upper arm - BILLABLE CODE

  • Use M61.122 for Myositis ossificans progressiva, left upper arm - BILLABLE CODE

  • Use M61.129 for Myositis ossificans progressiva, unspecified arm - BILLABLE CODE

  • M61.13 for Myositis ossificans progressiva, forearm - NON-BILLABLE CODE

  • Use M61.131 for Myositis ossificans progressiva, right forearm - BILLABLE CODE

  • Use M61.132 for Myositis ossificans progressiva, left forearm - BILLABLE CODE

  • Use M61.139 for Myositis ossificans progressiva, unspecified forearm - BILLABLE CODE

  • M61.14 for Myositis ossificans progressiva, hand and finger(s) - NON-BILLABLE CODE

  • Use M61.141 for Myositis ossificans progressiva, right hand - BILLABLE CODE

  • Use M61.142 for Myositis ossificans progressiva, left hand - BILLABLE CODE

  • Use M61.143 for Myositis ossificans progressiva, unspecified hand - BILLABLE CODE

  • Use M61.144 for Myositis ossificans progressiva, right finger(s) - BILLABLE CODE

  • Use M61.145 for Myositis ossificans progressiva, left finger(s) - BILLABLE CODE

  • Use M61.146 for Myositis ossificans progressiva, unspecified finger(s) - BILLABLE CODE

  • M61.15 for Myositis ossificans progressiva, thigh - NON-BILLABLE CODE

  • Use M61.151 for Myositis ossificans progressiva, right thigh - BILLABLE CODE

  • Use M61.152 for Myositis ossificans progressiva, left thigh - BILLABLE CODE

  • Use M61.159 for Myositis ossificans progressiva, unspecified thigh - BILLABLE CODE

  • M61.16 for Myositis ossificans progressiva, lower leg - NON-BILLABLE CODE

  • Use M61.161 for Myositis ossificans progressiva, right lower leg - BILLABLE CODE

  • Use M61.162 for Myositis ossificans progressiva, left lower leg - BILLABLE CODE

  • Use M61.169 for Myositis ossificans progressiva, unspecified lower leg - BILLABLE CODE

  • M61.17 for Myositis ossificans progressiva, ankle, foot and toe(s) - NON-BILLABLE CODE

  • Use M61.171 for Myositis ossificans progressiva, right ankle - BILLABLE CODE

  • Use M61.172 for Myositis ossificans progressiva, left ankle - BILLABLE CODE

  • Use M61.173 for Myositis ossificans progressiva, unspecified ankle - BILLABLE CODE

  • Use M61.174 for Myositis ossificans progressiva, right foot - BILLABLE CODE

  • Use M61.175 for Myositis ossificans progressiva, left foot - BILLABLE CODE

  • Use M61.176 for Myositis ossificans progressiva, unspecified foot - BILLABLE CODE

  • Use M61.177 for Myositis ossificans progressiva, right toe(s) - BILLABLE CODE

  • Use M61.178 for Myositis ossificans progressiva, left toe(s) - BILLABLE CODE

  • Use M61.179 for Myositis ossificans progressiva, unspecified toe(s) - BILLABLE CODE

  • Use M61.18 for Myositis ossificans progressiva, other site - BILLABLE CODE

  • Use M61.19 for Myositis ossificans progressiva, multiple sites - BILLABLE CODE

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.


Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Fibrodysplasia ossificans progressiva

Patient Education


Bone Diseases

Your bones help you move, give you shape and support your body. They are living tissues that rebuild constantly throughout your life. During childhood and your teens, your body adds new bone faster than it removes old bone. After about age 20, you can lose bone faster than you make bone. To have strong bones when you are young, and to prevent bone loss when you are older, you need to get enough calcium, vitamin D, and exercise. You should also avoid smoking and drinking too much alcohol.

Bone diseases can make bones easy to break. Different kinds of bone problems include:

  • Low bone density and osteoporosis, which make your bones weak and more likely to break
  • Osteogenesis imperfecta makes your bones brittle
  • Paget's disease of bone makes them weak
  • Bones can also develop cancer and infections
  • Other bone diseases, which are caused by poor nutrition, genetics, or problems with the rate of bone growth or rebuilding

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases


[Learn More in MedlinePlus]

Genetic Disorders

Genes are the building blocks of heredity. They are passed from parent to child. They hold DNA, the instructions for making proteins. Proteins do most of the work in cells. They move molecules from one place to another, build structures, break down toxins, and do many other maintenance jobs.

Sometimes there is a mutation, a change in a gene or genes. The mutation changes the gene's instructions for making a protein, so the protein does not work properly or is missing entirely. This can cause a medical condition called a genetic disorder.

You can inherit a gene mutation from one or both parents. A mutation can also happen during your lifetime.

There are three types of genetic disorders:

  • Single-gene disorders, where a mutation affects one gene. Sickle cell anemia is an example.
  • Chromosomal disorders, where chromosomes (or parts of chromosomes) are missing or changed. Chromosomes are the structures that hold our genes. Down syndrome is a chromosomal disorder.
  • Complex disorders, where there are mutations in two or more genes. Often your lifestyle and environment also play a role. Colon cancer is an example.

Genetic tests on blood and other tissue can identify genetic disorders.

NIH: National Library of Medicine


[Learn More in MedlinePlus]

Muscle Disorders

Your muscles help you move and help your body work. Different types of muscles have different jobs. There are many problems that can affect muscles. Muscle disorders can cause weakness, pain or even paralysis.

Causes of muscle disorders include:

  • Injury or overuse, such as sprains or strains, cramps or tendinitis
  • A genetic disorder, such as muscular dystrophy
  • Some cancers
  • Inflammation, such as myositis
  • Diseases of nerves that affect muscles
  • Infections
  • Certain medicines

Sometimes the cause of muscle disorders is unknown.


[Learn More in MedlinePlus]

Fibrodysplasia ossificans progressiva

Fibrodysplasia ossificans progressiva is a disorder in which muscle tissue and connective tissue such as tendons and ligaments are gradually replaced by bone (ossified), forming bone outside the skeleton (extra-skeletal or heterotopic bone) that limits movement. This process generally becomes noticeable in early childhood, starting with the neck and shoulders and proceeding down the body and into the limbs.

Extra-skeletal bone formation causes progressive loss of mobility as the joints become affected. Inability to fully open the mouth may cause difficulty in speaking and eating. Over time, people with this disorder may experience malnutrition due to their eating problems. They may also have breathing difficulties as a result of extra bone formation around the rib cage that restricts expansion of the lungs.

Any trauma to the muscles of an individual with fibrodysplasia ossificans progressiva, such as a fall or invasive medical procedures, may trigger episodes of muscle swelling and inflammation (myositis) followed by more rapid ossification in the injured area. Flare-ups may also be caused by viral illnesses such as influenza.

People with fibrodysplasia ossificans progressiva are generally born with malformed big toes. This abnormality of the big toes is a characteristic feature that helps to distinguish this disorder from other bone and muscle problems. Affected individuals may also have short thumbs and other skeletal abnormalities.


[Learn More in MedlinePlus]

Progressive osseous heteroplasia

Progressive osseous heteroplasia is a disorder in which bone forms within skin and muscle tissue. Bone that forms outside the skeleton is called heterotopic or ectopic bone. In progressive osseous heteroplasia, ectopic bone formation begins in the deep layers of the skin (dermis and subcutaneous fat) and gradually moves into other tissues such as skeletal muscle and tendons. The bony lesions within the skin may be painful and may develop into open sores (ulcers). Over time, joints can become involved, resulting in impaired mobility.

Signs and symptoms of progressive osseous heteroplasia usually become noticeable during infancy. In some affected individuals, however, the disorder may not become evident until later in childhood or in early adulthood.


[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.