Certain Infectious & Parasitic Diseases
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Three digit categories:
A00 – A09 Intestinal infectious diseases
A80 – A89 Viral infections of the central nervous system
Often additional codes are used in addition to codes in this chapter
Example: Penicillin
-resistant streptoccocal pneumoniae
Code infection first
Example:
Certain infectious & parasitic diseases
Not all diseases are coded here
General notations that pertain to three digit categories are listed prior to their code sets
Example: A00 – B99
§Includes: diseases generally recognized as communicable or transmissible
Exclude 2: infectious and parasitic diseases specific to the perinatal period (P35 – P39)
General notations that pertain to three digit categories are listed prior to their code sets
Example: A00 – B99
§Excludes 1: carrier of suspected carrier of infectious disease (Z22.-) certain localized infections – see body system – related chapters
§Exclude 2: infectious and parasitic diseases specific to the perinatal period (P35 – P39)
Example:
Exclusion notes state respiratory infections should be coded using J00 – J22 and, and exclude most diseases effecting pregnancy, childbirth, and puerperium.
The first set of codes are Intestinal Infectious Diseases
This includes all causes of intestinal infections, including food-borne intoxicants
Cross-Walk Example
ICD-9-CM
002 -Typhoid and paratyphoid fevers
002.0 – Typhoid Fever
002.1 – Paratyphoid fever A
002.2 – Paratyphoid fever B
002.3 – Paratyphoid fever C
002.9 – Paratyphoid fever, unspecified
ICD-10-CM
A01 – Typhoid and paratyphoid fevers
A01.0 – Typhoid fever
Infection due to Salmonella typhi
A01.00 - Typhoid fever, unspecified
A01.01 – Typhoid meningitis
A01.02 - Typhoid fever with heart involvment
Typhoid endocarditis
Typhoid myocarditis
A01.03 –Typhoid pneumonia
A01.04 – Typhoid arthritis
A01.05 – Typhoid osteomyelitis
A01.09 – Typhoid fever with other complications
A01.1 – Paratyphoid fever A
A01.2 – Paratyphoid fever B
A01.3 – Paratyphoid fever C
A01.4 – Paratyphoid fever, unspecified
Example:
A09 – Infectious gastroenteritis and colitis unspecified
Codes include infections due to mycobacterium TB and mycobacterium bovis and exclude congenital TB, any type of pneumoconiosis associated with TB, sequelae TB, and silicotuberculosis
Specific codes also have individuals exclude notations
Example:
TB of “other organs” include:
Certain zoonotic bacterial diseases
Any infectious disease that can be transmitted from animals to humans is considered a zoonotic disease
Of the 1415 known pathogens that effect humans 61% are zoonotic
Zoonotic bacterial diseases are divided as follows:
A28 – Other zoonotic bacterial diseases, NEC
Examples of codes in this chapter include:
In the ICD-9-CM listeriosis was categorized under zoonotic bacterial diseases and was assigned a single code
Listeriosis is categorized in the ICD-10-CM under “Other Bacterial Diseases” and has the following codes:
A32 - Listeriosis
A32.9 – Listerosis, unspecified
Whooping Cough Cross-walk
ICD-9-CM
033 Whooping cough
033.0 – Bordetella pertussis (B. pertussis)
033.1 – Bordetella parapertussis (B. parapertussis)
033.8 – Whooping cough due to other specified organism
033.9 – Whooping cough, unspecified organism
ICD-10-CM
A37 – Whooping Cough
A37.00 – whooping cough due to Bordetella pertussis without pneumonia
A37.01 - whooping cough due to Bordetella pertussis with pneumonia
A37.10 – Whooping cough due to Bordetella parapertussis without pneumonia
A37.11 - Whooping cough due to Bordetella parapertussis with pneumonia
A37.80 – Whooping cough due to other Bordetella species without pneumonia
A37.81 - Whooping cough due to other Bordetella species with pneumonia
A37.90 – Whooping cough, unspecified species, without pneumonia
A37.91 - Whooping cough, unspecified species, with pneumonia
Scarlet fever in the ICD-9-CM was a single code
In the ICD-10-CM scarlet fever is now the following four codes:
In order to select the proper codes it is important to understand how the ICD defines each condition and ensure providers align their terminology with them
Septicemia: refers to a systemic disease associated with the presence of pathological microorganisms or toxins in the blood, which can include bacteria, viruses, fungi, or other organisms
Systemic Inflammatory Disease (SIRS): generally refers to the systemic response to infection, trauma/burns, or other insult (such as cancer) with symptoms including fever, tachycardia, tachypnea, and leukocytosis
Sepsis: generally referred to as SIRS due to infection
Sever Sepsis: sepsis with associated acute organ dysfunction
Urosepsis
In the ICD-9-CM the default code in the index for “urosepsis” was 599.0 (uti)
According to the ICD-10-CM coding guidelines the term urosepsis is a non-specific term with no default code and is not considered synonomous with sepsis. If the term is used by a provider the record must be sent back for clarificaiton
If a patient is diagnosed with sepsis and acute organ dysfunction and/or multiple organ dysfunction (MOD) code according to sever sepsis guidelines
Sever sepsis requires a minimum of two codes
-
Code underlying systemic disease
-
Select the appropriate code from subcatagory R65.2 (sever sepsis)
-
If a organism is not documented assign code A41.9
-
Assign any additional organ dysfunction codes
Coding septic shock:
1) Code first the underlying systemic infection
2) Code R65.21 (this code encompasses sever sepsis as well)
3) Additional organ dysfunction codes
Codes from category R65.2- are never assigned as primary codes
If a patient has sepsis due to a postprocedural infection code:
- Postproccedural infection (ex. T80.2 Infections following infusions and therapeutic infections)
- Code specific infection
- If the documentation supports sever sepsis assign a code from R65.2- as an additional code
Example of codes in this section include:
Terms to watch for when using syphilis codes:
Examples:
A50.05
A51.45
These are diseases caused by a distinct type of bacteria that has a long, coiled cell, which moves in a twisting motion
Examples of Spirochetal Codes:
Other diseases caused by chlamydiae
These codes exclude sexually transmitted chlamydial diseases (A55-A56)
Rickettsioses
Rickettsia is any group of rod-shaped bacteria that live in biting arthropods causing multiple diseases, such as:
Viral Infections of the Central Nervous System
Examples of codes and conditions used here include:
Arthropod-borne viral fevers and viral hemorrhagic fevers
These codes are used to identify viral fevers carried by arthropods such as mosquitoes and ticks.
Examples of codes and conditions included in this category are:
Viral infections characterized by skin and mucous membrane lesions
This category includes:
There is a notation beneath code B03 – Smallpox, which reads
Some codes in this grouping have changed slightly in their descriptions and/or quantity of codes
Example
ICD-9-CM
053 - Herpes Zoster
053.0 – with meningitis
053.1 – With Nervous system complications
053.10 - With unspecified nervous system complication
053.11 – Geniculate herpes zoster
053.12 – Postherpetic trigeminal neuralgia
053.13 – Postherpetic polyneuropathy
053.14 – Herpes zoster myelitis
053.13 - Other
ICD-10-CM
B02 – Zoster [herpes zoster]
B02.0 – Zoster encephalitis
B02.1 - Zoster meningitis
B02.2 – Zoster with other nervous system involvement
B02.21 – Postherpetic geniculate ganglionitis
B02.22 – Postherpetic trigeminal neuralgia
B02.23 – Postherpetic polyneuropathy
B02.24 – Postherpetic myelitis
B02.29 – Other postherpetic nervous system involvement
Some codes in this grouping have changed largely in their descriptions and/or quantity
ICD-9-CM
052 – Chickenpox
052.0 – Postvaricella encephalitis
052.1 – Varicella (hemorrhagic) pneumonitis
052.2 – Postvaricella myelitis
052.7 – With other specified complications
052.8 – With unspecified complications
052.9 – Varicella without mention of complications
ICD-10-CM
B01 – Varicalla [chickenpox]
B01.0 – Varicella meningitis
B01.1 – Varicella encephalitis, myelitis, and encephalomyelitis
B01.11 – Varicella encephalitis and encephalomyelitis
B01.12 – Varicella myelitis
B01.2 – Varicella pneumonia
B01.8 – Varicella with other complications
B01.81 – Vericella keratitis
B01.89 – Other varicella complications
B01.9 – Varacella without complication
These codes exclude
Codes here do include human herpesvirus:
B15 –B19 is used for viral hepatitis
These codes are grouped as follows:
There are a total of 22 specific codes in this catagory
HIV
This is the only code listed for HIV
Guidelines state that is a patient is admitted for HIV related conditions B20 should be the principal diagnosis followed by additional diagnosis of related conditions
If a patient is admitted for an unrelated condition (ex. Trauma), code the unrelated conditions as the principal diagnosis followed by B20 and HIV related conditions
Sequencing is not effected by a new diagnosis vs an established one
If a patient is diagnosed with HIV or has a record of:
But is asymptomatic use code Z21 instead of B20
Do not use code Z21 for the term “AIDS”
A patient who has had an HIV test that is inconclusive uses code R75:
Any patient with a previous record of HIV related illnesses should always be assigned B20 on subsequent records
Once a patient is assigned the B20 code codes R75 and Z21 should never be used for them again.
If a patient is pregnant, giving birth, or post partum and is seen for HIV related illnesses sequencing rules state the HIV code should be first. This scenario is different though.
Use code O98.7x first
Followed by B20
Code from chapter 15 (materninty) ALWAYS take priority sequencing
If a patient is pregnant, giving birth, or post partum and is seen for HIV related illnesses sequencing rules state the HIV code should be first. This scenario is different though.
Use code O98.7x first
Followed by B20
Code from chapter 15 (materninty) ALWAYS take priority sequencing
Patient who are being seen to determine his/her HIV status are assigned code Z11.4
If a patient with signs or symptoms are being screened use additional counseling code
Code Z71.7 is also assigned when a patient returns for test results that are negative
If results are positive either B20 or Z21 is assigned (according to guidelines)
Codes B25- B34 are classified under “other viral diseases”
These include:
B27.00 – B27.99
Viral Conjunctivitis
Other viral disease NEC
Viral Infections Unspecified
Mycoses are coded using B35 – B49
Mycosis (plural: Mycoses) is a fungal infection of animals, including humans. Mycoses are common, and a variety of environmental and physiological conditions and can contribute to the development of fungal diseases. Inhalation of fungal spores or localized colonization of the skin may initiate persistent infections; therefore, mycoses often start in the lungs or on the skin.
These codes exclude hypersensitivity pneumonitis due to organic dust (J67.x) and mycosis fungoides (C84.0x)
Skin related codes (dermatophytosis) utilize code B35 – B38
Examples of codes in this grouping include:
Histoplasmosis – B39
Histoplasmosis (also known as "Cave disease“, "Darling's disease“, "Ohio valley disease”, "Reticuloendotheliosis”, "Spelunker’s Lung”.) This disease is caused by the fungus Histoplasma capulatum . Symptoms of this infection vary greatly, but the disease primarily affects the lungs. Occasionally, other organs are affected; this is called disseminated histoplasmosis, and it can be fatal if left untreated. Histoplasmosis is common among AIDs patients because of their suppressed immune system.
Notations beneath B39 states to first code associated AIDS (B20)
Use additional codes for associated manifestations
Endocatditis – I39
Pericarditis – I32
Protozoal diseases
This category is a new grouping
The ICD-9-CM divided diseases in this grouping under multiple different headings
Malaria
Cross-Walk-Example
ICD-9-CM
084 - Malaria
084.0 - Falciparum malaria
084.1 - Vivax malaria
084.2 - Quartan malaria
084.3 - Ovle malaria
084.5 - mixed malaria
084.6 - Malaria Unspecified
084.7 - Induced Malaria
084.8 - Blackwater fever
084.9 - Other pernicious complications of malaria
ICD-10-CM
B50 – Plasmodium Falciparum Malaria
B50.0 - Plasmodium falciparum malaria with cerebral complicaitons
B50.8 – Other severe and complicated plasmodium falciparum malaria
B50.9 – Plasmodium falciparum malaria, unspecified
B51 – Plasmodia vivax malaria
B51.0 – Plasmodium vivax malaria with ruptured spleen
B51.8 – Plasmodium vivax malaria with other complications
B51.9 – Plasmodium vivax malaria without complication
B52 – Plasmodium malariae malaria
B52.0 – plasmodium malariae malaria with nephropathy
B52.8 – Plasmodium malariae malaria with other complicationd
B52.9 – Plasmodium malariae malaria without complication
B53 – Other specified malaria
B53.0 – Plasmodium ovale malaria
B53.1 – Malaria due to simian plasmodia
B53.8 – Other malaria, NEC
B54 – Unspecified malaria
Helminthiases
Helminthiasis - a macroparasitic human disease of humans and animals in which a part of the body is infested with parasitic worms, such as pinworm, roundworm, or tapeworm. Typically, the worms reside in the gastrointestinal tract but may also burrow into the liver or other organs.
Schistosomiasis
Spreads through contaminated water and effects live and lungs
Fluke Infections
Fluke infections include:
Enchinococcus infections
Examples of other infections listed under the helminthiases grouping include:
Pediculousis, Acariasis, and other infestations
These codes include infestations such as:
Myiasis
Sequelae is a pathological condition resulting from disease, injury, or other trauma.
Codes in this grouping are used to indicate conditions in categories A00 –B89 as the cause of sequelae.
Code first any condition resulting from (sequela), the infections or parasitic disease.
Bacterial and Viral Infectious Agents
Codes in this grouping are to be used as additional or supplementary codes to identify the infectious agent in diseases classified elsewhere.
Examples of other codes in this category include:
Code B99.8 and B99.9
Codes in this chapter can be looked up in the alphabetic index under:
Common notations in this chapter include:
Excludes 2
Exclude 1: Not Coded Here! These two codes can never be reported together
Exclude 2: Not included here. Can be reported in conjunction with other code if supported by documentation.

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