Version 2024

2024 ICD-10-CM Diagnosis Code M00.9

Pyogenic arthritis, unspecified

ICD-10-CM Code:: M00.9
ICD-10 Code for:: Pyogenic arthritis, unspecified
Is Billable?: Yes - Valid for Submission
Chronic Condition Indicator: ^[1]: Not chronic
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Code Information
Approximate Synonyms
Clinical Classification
Tabular List of Diseases and Injuries
Index to Diseases and Injuries References
Diagnostic Related Groups Mapping
Convert to ICD-9 Code
Patient Education
Other Codes Used Similar Conditions
Code History

Code Classification

Diseases of the musculoskeletal system and connective tissue
(M00–M99)
- Infectious arthropathies
  (M00-M02)
  - Pyogenic arthritis
    (M00)

M00.9 is a billable diagnosis code used to specify a medical diagnosis of pyogenic arthritis, unspecified. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

Unspecified diagnosis codes like M00.9 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

Acute bacterial arthritis
Acute infective arthritis
Acute infective polyarthritis
Acute polyarthritis
Acute suppurative arthritis
Acute suppurative arthritis due to bacteria
Arthritis due to parasitic infection
Arthritis due to viral infection
Arthritis of lower limb due to parasitic infection
Arthritis of temporomandibular joint due to internal joint prosthesis
Bilateral infective arthritis of knees
Chronic infective arthritis
Chronic infective polyarthritis
Cystic acne
Elbow pyogenic arthritis
Infectious arthritis of temporomandibular joint
Infectious arthritis of temporomandibular joint
Infectious arthritis of temporomandibular joint due to internal joint prosthesis
Infectious disorder of joint
Infective arthritis
Infective arthritis co-occurrent with human immunodeficiency virus infection
Infective arthritis co-occurrent with human immunodeficiency virus infection
Infective arthritis of ankle and/or foot
Infective arthritis of distal interphalangeal joint of finger
Infective arthritis of elbow
Infective arthritis of first metatarsophalangeal joint
Infective arthritis of interphalangeal joint of toe
Infective arthritis of joint of hand
Infective arthritis of joint of hand
Infective arthritis of joint of hand
Infective arthritis of joint of hand
Infective arthritis of joint of hand
Infective arthritis of left ankle
Infective arthritis of left elbow
Infective arthritis of left foot
Infective arthritis of left hand
Infective arthritis of left hip
Infective arthritis of left knee
Infective arthritis of left shoulder
Infective arthritis of left wrist
Infective arthritis of metatarsophalangeal joint of lesser toe
Infective arthritis of pelvis
Infective arthritis of proximal interphalangeal joint of finger
Infective arthritis of right ankle
Infective arthritis of right elbow
Infective arthritis of right foot
Infective arthritis of right hand
Infective arthritis of right hip
Infective arthritis of right knee
Infective arthritis of right shoulder
Infective arthritis of right wrist
Infective arthritis of shoulder region
Infective arthritis of wrist
Infective arthritis with AIDS
Infective polyarthritis
Interphalangeal joint of toe inflamed
Knee pyogenic arthritis
Polyarticular viral arthritis
Pyogenic arthritis of foot
Pyogenic arthritis of hip
Pyogenic arthritis of multiple sites
Pyogenic arthritis of pelvic region
Pyogenic arthritis of shoulder region
Pyogenic arthritis of the ankle and/or foot
Pyogenic arthritis of the pelvic region and thigh
Pyogenic arthritis, pyoderma gangrenosum, acne syndrome
Pyogenic bacterial arthritis
Subacute arthritis
Subacute arthritis
Subacute arthropathy
Subacute arthropathy
Subacute infective arthritis
Subacute infective polyarthritis
Suppurative arthritis
Wrist pyogenic arthritis

Clinical Classification

Clinical Category	CCSR Category Code	Inpatient Default CCSR	Outpatient Default CCSR
Bacterial infections	INF003	N - Not default inpatient assignment for principal diagnosis or first-listed diagnosis.	N - Not default outpatient assignment for principal diagnosis or first-listed diagnosis.
Infective arthritis	MUS001	Y - Yes, default inpatient assignment for principal diagnosis or first-listed diagnosis.	Y - Yes, default outpatient assignment for principal diagnosis or first-listed diagnosis.

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

Infective arthritis NOS

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).

- Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) - L02.91
- - knee - See Also: Abscess, lower limb;
  - - joint - M00.9

- Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) - M19.90
- - pyogenic or pyemic (any site except spine) - M00.9

- Disease, diseased - See Also: Syndrome;
- - hip (joint) - M25.9
  - - suppurative - M00.9

- Infection, infected, infective (opportunistic) - B99.9
- - acromioclavicular - M00.9
- - hip (joint) NEC - M00.9
- - joint NEC - M00.9
- - knee (joint) NEC - M00.9
  - - joint - M00.9
- - metatarsophalangeal - M00.9
- - shoulder (joint) NEC - M00.9

M00.9 is grouped with Diagnostic Related Groups - MS-DRG Mapping

Diagnostic Related Groups (DRGs) are a classification system used to group together diagnosis codes for the purpose of reimbursement and healthcare management. DRGs are used to standardize the way hospitals and other providers are paid for inpatient services. In this system patients are grouped together based on their principal diagnosis in areas referred to as Major Diagnostic Categories (MDC). Once a patient is assigned a particular diagnostic category, providers receive a predetermined payment rate for the services rendered. This reimbursement rate is often fixed and is meant to cover the cost of care for that patient. Reimbursement is also affected by the relative weight of a diagnostic related group based on the severity of a patient's illness and the associated cost of care during hospitalization.

Diagnostic related groups encourage healthcare providers to focus on quality and efficiency in patient care while managing costs effectively. The diagnosis code is present in the following groups for version MS-DRG V41.0 applicable from 10/01/2023 through 09/30/2024.

MS-DRG	MS-DRG Title	MCD	Relative Weight
485	KNEE PROCEDURES WITH PRINCIPAL DIAGNOSIS OF INFECTION WITH MCC	08	3.294
486	KNEE PROCEDURES WITH PRINCIPAL DIAGNOSIS OF INFECTION WITH CC	08	2.0083
487	KNEE PROCEDURES WITH PRINCIPAL DIAGNOSIS OF INFECTION WITHOUT CC/MCC	08	1.5449

The relative weight of a diagnostic related group determines the reimbursement rate based on the severity of a patient's illness and the associated cost of care during hospitalization.

Convert M00.9 to ICD-9-CM

ICD-9-CM Code: 711.00 - Pyogen arthritis-unspec
Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

Patient Education

Infectious 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.

[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.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.