ICD-10 Diagnosis Code M00.121

• 548 - SEPTIC ARTHRITIS WITH MCC
• 549 - SEPTIC ARTHRITIS WITH CC
• 550 - SEPTIC ARTHRITIS WITHOUT CC/MCC

• 711.02 - Pyogen arthritis-up/arm (Combination Flag)
• 041.2 - Pneumococcus infect NOS (Combination Flag)

Also called: Septic arthritis

Most kinds of arthritis cause pain and swelling in your joints. Joints are places where two bones meet, such as your elbow or knee. Infectious arthritis is an infection in the joint. The infection comes from a bacterial, viral, or fungal infection that spreads from another part of the body. Symptoms of infectious arthritis include

• Intense pain in the joint
• Joint redness and swelling
• Chills and fever
• Inability to move the area with the infected joint

One type of infectious arthritis is reactive arthritis. The reaction is to an infection somewhere else in your body. The joint is usually the knee, ankle, or toe. Sometimes, reactive arthritis is set off by an infection in the bladder, or in the urethra, which carries urine out of the body. In women, an infection in the vagina can cause the reaction. For both men and women, it can start with bacteria passed on during sex. Another form of reactive arthritis starts with eating food or handling something that has bacteria on it.

To diagnose infectious arthritis, your health care provider may do tests of your blood, urine, and joint fluid. Treatment includes medicines and sometimes surgery.

• Fungal arthritis (Medical Encyclopedia)
• HLA-B27 antigen (Medical Encyclopedia)
• Reactive arthritis (Medical Encyclopedia)
• Septic arthritis (Medical Encyclopedia)
• Viral arthritis (Medical Encyclopedia)

Also called: Streptococcus pneumoniae infections

Pneumococci are a type of streptococcus bacteria. The bacteria spread through contact with people who are ill or by healthy people who carry the bacteria in the back of their nose. Pneumococcal infections can be mild or severe. The most common types of infections are

• Ear infections
• Sinus infections
• Pneumonia
• Sepsis
• Meningitis

How the diagnosis is made depends upon where the infection is. Your doctor will do a physical exam and health history. Possible tests may include blood, imaging, or lab tests. Treatment is with antibiotics. Vaccines can prevent pneumococcal infections. There are two vaccines. One is for infants and young children. The other is for people at high risk, including those who are over 65 years old, have chronic illnesses or weak immune systems, smoke, have asthma, or live in long-term care facilities.

Centers for Disease Control and Prevention

• Meningitis - pneumococcal (Medical Encyclopedia)
• Pneumococcal Conjugate Vaccine (PCV13): What You Need to Know (Centers for Disease Control and Prevention)
• Pneumococcal Disease: Information for Parents (American Academy of Family Physicians)
• Pneumococcal Disease: Information for Parents (Centers for Disease Control and Prevention)
• Pneumococcal Disease: Information for Parents (American Academy of Pediatrics)
• Pneumococcal Polysaccharide Vaccine: What You Need to Know (Centers for Disease Control and Prevention)
• Pneumococcal Polysaccharide Vaccine: What You Need to Know (Immunization Action Coalition)

General Equivalence Map Definitions
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

• Approximate Flag - The approximate flag is on, indicating that the relationship between the code in the source system and the code in the target system is an approximate equivalent.
• No Map Flag - The no map flag indicates that a code in the source system is not linked to any code in the target system.
• Combination Flag - The combination flag indicates that more than one code in the target system is required to satisfy the full equivalent meaning of a code in the source system.

Present on Admission
The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement.