Poisoning by, adverse effect of and underdosing of systemic antibiotics (T36)

Browse all the diagnosis codes used for poisoning by, adverse effect of and underdosing of systemic antibiotics (t36). For easy navigation, the diagnosis codes are sorted in alphabetical order and grouped by sections. Each section is clearly marked with its description, and the corresponding three-digit code range. This format makes it simple to browse diagnosis codes in this chapter or section and find what you're looking for. We've also added green checkmark icons to label billable codes, and red warning icons for non-billable ones. This makes it easy to identify which codes can be billed.

Clinical Information

Amikacin - A broad-spectrum antibiotic derived from KANAMYCIN. It is reno- and oto-toxic like the other aminoglycoside antibiotics.

Aminoglycosides - Glycosylated compounds in which there is an amino substituent on the glycoside. Some of them are clinically important ANTIBIOTICS.

Amoxicillin - A broad-spectrum semisynthetic antibiotic similar to AMPICILLIN except that its resistance to gastric acid permits higher serum levels with oral administration.

Amoxicillin-Potassium Clavulanate Combination - A fixed-ratio combination of amoxicillin trihydrate and potassium clavulanate.

Amphotericin B - Macrolide antifungal antibiotic produced by Streptomyces nodosus obtained from soil of the Orinoco river region of Venezuela.

Ampicillin - Semi-synthetic derivative of penicillin that functions as an orally active broad-spectrum antibiotic.

Ampicillin Resistance - Nonsusceptibility of a microbe to the action of ampicillin, a penicillin derivative that interferes with cell wall synthesis.

Azithromycin - A semi-synthetic macrolide antibiotic structurally related to ERYTHROMYCIN. It has been used in the treatment of Mycobacterium avium intracellulare infections, toxoplasmosis, and cryptosporidiosis.

Azlocillin - A semisynthetic ampicillin-derived acylureido penicillin.

Aztreonam - A monocyclic beta-lactam antibiotic originally isolated from Chromobacterium violaceum. It is resistant to beta-lactamases and is used in gram-negative infections, especially of the meninges, bladder, and kidneys. It may cause a superinfection with gram-positive organisms.

Capreomycin - Cyclic peptide antibiotic similar to VIOMYCIN. It is produced by Streptomyces capreolus.

Carbenicillin - Broad-spectrum semisynthetic penicillin derivative used parenterally. It is susceptible to gastric juice and penicillinase and may damage platelet function.

Carfecillin - The phenyl ester of CARBENICILLIN that, upon oral administration, is broken down in the intestinal mucosa to the active antibacterial. It is used for urinary tract infections.

Cefaclor - Semisynthetic, broad-spectrum antibiotic derivative of CEPHALEXIN.

Cefadroxil - Long-acting, broad-spectrum, water-soluble, CEPHALEXIN derivative.

Cefamandole - Semisynthetic wide-spectrum cephalosporin with prolonged action, probably due to beta-lactamase resistance. It is used also as the nafate.

Cefatrizine - Orally active semisynthetic cephalosporin antibiotic with broad-spectrum activity.

Cefazolin - A semisynthetic cephalosporin analog with broad-spectrum antibiotic action due to inhibition of bacterial cell wall synthesis. It attains high serum levels and is excreted quickly via the urine.

Cefixime - A third-generation cephalosporin antibiotic that is stable to hydrolysis by beta-lactamases.

Cefmenoxime - A cephalosporin antibiotic that is administered intravenously or intramuscularly. It is active against most common gram-positive and gram-negative microorganisms, is a potent inhibitor of Enterobacteriaceae, and is highly resistant to hydrolysis by beta-lactamases. The drug has a high rate of efficacy in many types of infection and to date no severe side effects have been noted.

Cefmetazole - A semisynthetic cephamycin antibiotic with a broad spectrum of activity against both gram-positive and gram-negative microorganisms. It has a high rate of efficacy in many types of infection and to date no severe side effects have been noted.

Cefonicid - A second-generation cephalosporin administered intravenously or intramuscularly. Its bactericidal action results from inhibition of cell wall synthesis. It is used for urinary tract infections, lower respiratory tract infections, and soft tissue and bone infections.

Cefoperazone - Semisynthetic broad-spectrum cephalosporin with a tetrazolyl moiety that is resistant to beta-lactamase. It may be used to treat Pseudomonas infections.

Cefotaxime - Semisynthetic broad-spectrum cephalosporin.

Cefotetan - A semisynthetic cephamycin antibiotic that is administered intravenously or intramuscularly. The drug is highly resistant to a broad spectrum of beta-lactamases and is active against a wide range of both aerobic and anaerobic gram-positive and gram-negative microorganisms.

Cefotiam - One of the CEPHALOSPORINS that has a broad spectrum of activity against both gram-positive and gram-negative microorganisms.

Cefoxitin - A semisynthetic cephamycin antibiotic resistant to beta-lactamase.

Cefsulodin - A pyridinium-substituted semisynthetic, broad-spectrum antibacterial used especially for Pseudomonas infections in debilitated patients.

Ceftazidime - Semisynthetic, broad-spectrum antibacterial derived from CEPHALORIDINE and used especially for Pseudomonas and other gram-negative infections in debilitated patients.

Ceftizoxime - A semisynthetic cephalosporin antibiotic which can be administered intravenously or by suppository. The drug is highly resistant to a broad spectrum of beta-lactamases and is active against a wide range of both aerobic and anaerobic gram-positive and gram-negative organisms. It has few side effects and is reported to be safe and effective in aged patients and in patients with hematologic disorders.

Ceftriaxone - A broad-spectrum cephalosporin antibiotic and cefotaxime derivative with a very long half-life and high penetrability to meninges, eyes and inner ears.

Cefuroxime - Broad-spectrum cephalosporin antibiotic resistant to beta-lactamase. It has been proposed for infections with gram-negative and gram-positive organisms, GONORRHEA, and HAEMOPHILUS.

Cephalexin - A semisynthetic cephalosporin antibiotic with antimicrobial activity similar to that of CEPHALORIDINE or CEPHALOTHIN, but somewhat less potent. It is effective against both gram-positive and gram-negative organisms.

Cephaloglycin - A cephalorsporin antibiotic.

Cephaloridine - A cephalosporin antibiotic.

Cephalosporinase - A cephalosporin antibiotic.

Cephalosporins - A group of broad-spectrum antibiotics first isolated from the Mediterranean fungus ACREMONIUM. They contain the beta-lactam moiety thia-azabicyclo-octenecarboxylic acid also called 7-aminocephalosporanic acid.

Cephalothin - A cephalosporin antibiotic.

Cephradine - A semi-synthetic cephalosporin antibiotic.

Chloramphenicol - An antibiotic first isolated from cultures of Streptomyces venequelae in 1947 but now produced synthetically. It has a relatively simple structure and was the first broad-spectrum antibiotic to be discovered. It acts by interfering with bacterial protein synthesis and is mainly bacteriostatic. (From Martindale, The Extra Pharmacopoeia, 29th ed, p106)

Chloramphenicol O-Acetyltransferase - An enzyme that catalyzes the acetylation of chloramphenicol to yield chloramphenicol 3-acetate. Since chloramphenicol 3-acetate does not bind to bacterial ribosomes and is not an inhibitor of peptidyltransferase, the enzyme is responsible for the naturally occurring chloramphenicol resistance in bacteria. The enzyme, for which variants are known, is found in both gram-negative and gram-positive bacteria. EC 2.3.1.28.

Chloramphenicol Resistance - Nonsusceptibility of bacteria to the action of CHLORAMPHENICOL, a potent inhibitor of protein synthesis in the 50S ribosomal subunit where amino acids are added to nascent bacterial polypeptides.

Chlortetracycline - A TETRACYCLINE with a 7-chloro substitution.

Cilastatin, Imipenem Drug Combination - Combination of imipenem and cilastatin that is used in the treatment of bacterial infections; cilastatin inhibits renal dehydropeptidase I to prolong the half-life and increase the tissue penetration of imipenem, enhancing its efficacy as an anti-bacterial agent.

Ciprofloxacin - A broad-spectrum antimicrobial carboxyfluoroquinoline.

Clavulanic Acid - A beta-lactam antibiotic produced by the actinobacterium Streptomyces clavuligerus. It is a suicide inhibitor of bacterial beta-lactamase enzymes. Administered alone, it has only weak antibacterial activity against most organisms, but given in combination with other beta-lactam antibiotics it prevents antibiotic inactivation by microbial lactamase.

Clavulanic Acids - Acids, salts, and derivatives of clavulanic acid (C8H9O5N). They consist of those beta-lactam compounds that differ from penicillin in having the sulfur of the thiazolidine ring replaced by an oxygen. They have limited antibacterial action, but block bacterial beta-lactamase irreversibly, so that similar antibiotics are not broken down by the bacterial enzymes and therefore can exert their antibacterial effects.

Clindamycin - An antibacterial agent that is a semisynthetic analog of LINCOMYCIN.

Cloxacillin - A semi-synthetic antibiotic that is a chlorinated derivative of OXACILLIN.

Colistin - Cyclic polypeptide antibiotic from Bacillus colistinus. It is composed of Polymyxins E1 and E2 (or Colistins A, B, and C) which act as detergents on cell membranes. Colistin is less toxic than Polymyxin B, but otherwise similar; the methanesulfonate is used orally.

Cyclacillin - A cyclohexylamido analog of PENICILLANIC ACID.

Demeclocycline - A TETRACYCLINE analog having a 7-chloro and a 6-methyl. Because it is excreted more slowly than tetracycline, it maintains effective blood levels for longer periods of time.

Dibekacin - Analog of KANAMYCIN with antitubercular as well as broad-spectrum antimicrobial properties.

Dicloxacillin - One of the PENICILLINS which is resistant to PENICILLINASE.

Doxycycline - A synthetic tetracycline derivative with similar antimicrobial activity.

Enoxacin - A broad-spectrum 6-fluoronaphthyridinone antibacterial agent that is structurally related to NALIDIXIC ACID.

Enviomycin - Cyclic basic peptide related to VIOMYCIN. It is isolated from an induced mutant of Streptomyces griseoverticillatus var. tuberacticus and acts as an antitubercular agent with less ototoxicity than tuberactinomycin.

First Generation Cephalosporins - CEPHALOSPORIN agents with excellent coverage against gram-positive cocci, such as STAPHYLOCOCCUS and STREPTOCOCCUS. They have some activity against the gram-negative bacteria, but in general, gram-negative activity is decreased compared to 2nd, 3rd, and 4th generation cephalosporins.

Fleroxacin - A broad-spectrum antimicrobial fluoroquinolone. The drug strongly inhibits the DNA-supercoiling activity of DNA GYRASE.

Fosfomycin - An antibiotic produced by Streptomyces fradiae.

Framycetin - A component of NEOMYCIN that is produced by Streptomyces fradiae. On hydrolysis it yields neamine and neobiosamine B. (From Merck Index, 11th ed)

Fusidic Acid - An antibiotic isolated from the fermentation broth of Fusidium coccineum. (From Merck Index, 11th ed). It acts by inhibiting translocation during protein synthesis.

Griseofulvin - An antifungal agent used in the treatment of TINEA infections.

Imipenem - Semisynthetic thienamycin that has a wide spectrum of antibacterial activity against gram-negative and gram-positive aerobic and anaerobic bacteria, including many multiresistant strains. It is stable to beta-lactamases. Clinical studies have demonstrated high efficacy in the treatment of infections of various body systems. Its effectiveness is enhanced when it is administered in combination with CILASTATIN, a renal dipeptidase inhibitor.

Josamycin - A macrolide antibiotic from Streptomyces narbonensis. The drug has antimicrobial activity against a wide spectrum of pathogens.

Kanamycin - Antibiotic complex produced by Streptomyces kanamyceticus from Japanese soil. Comprises 3 components: kanamycin A, the major component, and kanamycins B and C, the minor components.

Kanamycin Kinase - A class of enzymes that inactivate aminocyclitol-aminoglycoside antibiotics (AMINOGLYCOSIDES) by regiospecific PHOSPHORYLATION of the 3' and/or 5' hydroxyl.

Kanamycin Resistance - Nonsusceptibility of bacteria to the antibiotic KANAMYCIN, which can bind to their 70S ribosomes and cause misreading of messenger RNA.

Kitasamycin - A macrolide antibiotic produced by Streptomyces kitasatoensis. The drug has antimicrobial activity against a wide spectrum of pathogens.

Levofloxacin - The L-isomer of Ofloxacin.

Lincomycin - An antibiotic produced by Streptomyces lincolnensis var. lincolnensis. It has been used in the treatment of staphylococcal, streptococcal, and Bacteroides fragilis infections.

Lymecycline - A semisynthetic antibiotic related to TETRACYCLINE. It is more readily absorbed than TETRACYCLINE and can be used in lower doses.

Macrolides - A group of often glycosylated macrocyclic compounds formed by chain extension of multiple PROPIONATES cyclized into a large (typically 12, 14, or 16)-membered lactone. Macrolides belong to the POLYKETIDES class of natural products, and many members exhibit ANTIBIOTIC properties.

Mepartricin - Polyene macrolide antibiotic with unknown composition. It is obtained from Streptomyces aureofaciens. It is used as an antifungal agent, an antiprotozoal agent, and in the treatment of BENIGN PROSTATIC HYPERTROPHY.

Methacycline - A broad-spectrum semisynthetic antibiotic related to TETRACYCLINE but excreted more slowly and maintaining effective blood levels for a more extended period.

Methicillin - One of the PENICILLINS which is resistant to PENICILLINASE but susceptible to a penicillin-binding protein. It is inactivated by gastric acid so administered by injection.

Methicillin Resistance - Non-susceptibility of a microbe to the action of METHICILLIN, a semi-synthetic penicillin derivative.

Methicillin-Resistant Staphylococcus aureus - A strain of Staphylococcus aureus that is non-susceptible to the action of METHICILLIN. The mechanism of resistance usually involves modification of normal or the presence of acquired PENICILLIN BINDING PROTEINS.

Mezlocillin - Semisynthetic ampicillin-derived acylureido penicillin. It has been proposed for infections with certain anaerobes and may be useful in inner ear, bile, and CNS infections.

Minocycline - A TETRACYCLINE analog, having a 7-dimethylamino and lacking the 5 methyl and hydroxyl groups, which is effective against tetracycline-resistant STAPHYLOCOCCUS infections.

Nafcillin - A semi-synthetic antibiotic related to penicillin.

Netilmicin - Semisynthetic 1-N-ethyl derivative of SISOMYCIN, an aminoglycoside antibiotic with action similar to gentamicin, but less ear and kidney toxicity.

Norfloxacin - A synthetic fluoroquinolone (FLUOROQUINOLONES) with broad-spectrum antibacterial activity against most gram-negative and gram-positive bacteria. Norfloxacin inhibits bacterial DNA GYRASE.

Novobiocin - An antibiotic compound derived from Streptomyces niveus. It has a chemical structure similar to coumarin. Novobiocin binds to DNA gyrase, and blocks adenosine triphosphatase (ATPase) activity. (From Reynolds, Martindale The Extra Pharmacopoeia, 30th ed, p189)

Nystatin - Macrolide antifungal antibiotic complex produced by Streptomyces noursei, S. aureus, and other Streptomyces species. The biologically active components of the complex are nystatin A1, A2, and A3.

Ofloxacin - A synthetic fluoroquinolone antibacterial agent that inhibits the supercoiling activity of bacterial DNA GYRASE, halting DNA REPLICATION.

Oleandomycin - Antibiotic macrolide produced by Streptomyces antibioticus.

Oxacillin - An antibiotic similar to FLUCLOXACILLIN used in resistant staphylococci infections.

Oxytetracycline - A TETRACYCLINE analog isolated from the actinomycete STREPTOMYCES RIMOSUS and used in a wide variety of clinical conditions.

Paromomycin - An aminoglycoside antibacterial and antiprotozoal agent produced by species of STREPTOMYCES.

Penicillinase - A beta-lactamase preferentially cleaving penicillins. (Dorland, 28th ed) EC 3.5.2.-.

Penicillins - A group of antibiotics that contain 6-aminopenicillanic acid with a side chain attached to the 6-amino group. The penicillin nucleus is the chief structural requirement for biological activity. The side-chain structure determines many of the antibacterial and pharmacological characteristics. (Goodman and Gilman's The Pharmacological Basis of Therapeutics, 8th ed, p1065)

Piperacillin - Semisynthetic, broad-spectrum, AMPICILLIN derived ureidopenicillin antibiotic proposed for PSEUDOMONAS infections. It is also used in combination with other antibiotics.

Piperacillin, Tazobactam Drug Combination - An antibiotic combination product of piperacillin and tazobactam, a penicillanic acid derivative with enhanced beta-lactamase inhibitory activity, that is used for the intravenous treatment of intra-abdominal, pelvic, and skin infections and for community-acquired pneumonia of moderate severity. It is also used for the treatment of PSEUDOMONAS AERUGINOSA INFECTIONS.

Pivampicillin - Pivalate ester analog of AMPICILLIN.

Pristinamycin - An antibiotic mixture originally isolated from Streptomyces pristinaspiralis. It is a mixture of compounds from STREPTOGRAMIN GROUP A: pristinamycin IIA and IIB and from STREPTOGRAMIN GROUP B: pristinamycin IA, pristinamycin IB, pristinamycin IC.

Ribostamycin - A broad-spectrum antimicrobial isolated from Streptomyces ribosifidicus.

Rifabutin - A broad-spectrum antibiotic that is being used as prophylaxis against disseminated Mycobacterium avium complex infection in HIV-positive patients.

Rifampin - A semisynthetic antibiotic produced from Streptomyces mediterranei. It has a broad antibacterial spectrum, including activity against several forms of Mycobacterium. In susceptible organisms it inhibits DNA-dependent RNA polymerase activity by forming a stable complex with the enzyme. It thus suppresses the initiation of RNA synthesis. Rifampin is bactericidal, and acts on both intracellular and extracellular organisms. (From Gilman et al., Goodman and Gilman's The Pharmacological Basis of Therapeutics, 9th ed, p1160)

Rifaximin - A synthetic rifamycin derivative and anti-bacterial agent that is used for the treatment of GASTROENTERITIS caused by ESCHERICHIA COLI INFECTIONS. It may also be used in the treatment of HEPATIC ENCEPHALOPATHY.

Ristocetin - An antibiotic mixture of two components, A and B, obtained from Nocardia lurida (or the same substance produced by any other means). It is no longer used clinically because of its toxicity. It causes platelet agglutination and blood coagulation and is used to assay those functions in vitro.

Rolitetracycline - A pyrrolidinylmethyl TETRACYCLINE.

Roxithromycin - Semisynthetic derivative of erythromycin. It is concentrated by human phagocytes and is bioactive intracellularly. While the drug is active against a wide spectrum of pathogens, it is particularly effective in the treatment of respiratory and genital tract infections.

Second Generation Cephalosporins - Agents with less activity against gram-positive cocci than FIRST GENERATION CEPHALOSPORINS but have increased activity against gram-negative bacilli.

Sisomicin - Antibiotic produced by Micromonospora inyoensis. It is closely related to gentamicin C1A, one of the components of the gentamicin complex (GENTAMICINS).

Spectinomycin - An antibiotic produced by Streptomyces spectabilis. It is active against gram-negative bacteria and used for the treatment of GONORRHEA.

Spiramycin - A macrolide antibiotic produced by Streptomyces ambofaciens. The drug is effective against gram-positive aerobic pathogens, N. gonorrhoeae, and staphylococci. It is used to treat infections caused by bacteria and Toxoplasma gondii.

Streptogramin A - A specific streptogramin group A antibiotic produced by Streptomyces graminofaciens and other bacteria.

Streptogramin B - A specific streptogramin group B antibiotic produced by Streptomyces graminofaciens and other bacteria.

Sulbactam - A beta-lactamase inhibitor with very weak antibacterial action. The compound prevents antibiotic destruction of beta-lactam antibiotics by inhibiting beta-lactamases, thus extending their spectrum activity. Combinations of sulbactam with beta-lactam antibiotics have been used successfully for the therapy of infections caused by organisms resistant to the antibiotic alone.

Sulbenicillin - Semisynthetic penicillin-type antibiotic.

Talampicillin - An ester of AMPICILLIN which is readily hydrolyzed on absorption to release ampicillin. It is well absorbed from the gastrointestinal tract resulting in a greater bioavailability of ampicillin than can be achieved with equivalent doses of ampicillin.

Teicoplanin - Lipoglycopeptide antibiotic from Actinoplanes teichomyceticus active against gram-positive bacteria. It consists of five major components each with a different fatty acid moiety.

Tetracycline - A naphthacene antibiotic that inhibits AMINO ACYL TRNA binding during protein synthesis.

Tetracycline Resistance - Nonsusceptibility of bacteria to the action of TETRACYCLINE which inhibits aminoacyl-tRNA binding to the 30S ribosomal subunit during protein synthesis.

Tetracyclines - Closely congeneric derivatives of the polycyclic naphthacenecarboxamide. (Gilman et al., Goodman and Gilman's The Pharmacological Basis of Therapeutics, 8th ed, p1117)

Thiamphenicol - A methylsulfonyl analog of CHLORAMPHENICOL. It is an antibiotic and immunosuppressive agent.

Third Generation Cephalosporins - Agents that are structurally similar to other CEPHALOSPORINS but have a broader spectrum of activity against bacteria than the first and second generation cephalosporins. These agents cover more resistant STREPTOCOCCUS, STAPHYLOCOCCUS, gram-positive anaerobes, and more resistant strains of HAEMOPHILUS, NEISSERIA, PROTEUS, ESCHERICHIA COLI, and KLEBSIELLA (HNPEK).

Ticarcillin - An antibiotic derived from penicillin similar to CARBENICILLIN in action.

Tobramycin - An aminoglycoside, broad-spectrum antibiotic produced by Streptomyces tenebrarius. It is effective against gram-negative bacteria, especially the PSEUDOMONAS species. It is a 10% component of the antibiotic complex, NEBRAMYCIN, produced by the same species.

Tobramycin, Dexamethasone Drug Combination - A topical preparation of tobramycin and dexamethasone that is used for treating or preventing superficial bacterial infections of the eye.

Troleandomycin - A macrolide antibiotic that is similar to ERYTHROMYCIN.

Vancomycin - Antibacterial obtained from Streptomyces orientalis. It is a glycopeptide related to RISTOCETIN that inhibits bacterial cell wall assembly and is toxic to kidneys and the inner ear.

Vancomycin Resistance - Nonsusceptibility of bacteria to the action of VANCOMYCIN, an inhibitor of cell wall synthesis.

Vancomycin-Resistant Enterococci - Strains of the genus Enterococcus that are resistant to the antibiotic VANCOMYCIN. The enterococci become resistant by acquiring plasmids carrying genes for VANCOMYCIN RESISTANCE.

Vancomycin-Resistant Staphylococcus aureus - Isolates of the Staphylococcus aureus that are resistant to the antibiotic VANCOMYCIN. The S. aureus becomes resistant by acquiring plasmids carrying genes for VANCOMYCIN RESISTANCE. Vancomycin‐intermediate S. aureus has low-level vancomycin resistance requiring an intermediate concentration of vancomycin between sensitive and resistant isolates. These S. aureus with reduced susceptibility to vancomycin and related GLYCOPEPTIDE antibiotics are often seen in HEALTHCARE ASSOCIATED INFECTIONS.

Viomycin - A strongly basic peptide, antibiotic complex from several strains of Streptomyces. It is allergenic and toxic to kidneys and the labyrinth. Viomycin is used in tuberculosis as several different salts and in combination with other agents.

Virginiamycin - A cyclic polypeptide antibiotic complex from Streptomyces virginiae, S. loidensis, S. mitakaensis, S. pristina-spiralis, S. ostreogriseus, and others. It consists of 2 major components, VIRGINIAMYCIN FACTOR M1 and virginiamycin Factor S1. It is used to treat infections with gram-positive organisms and as a growth promoter in cattle, swine, and poultry.

von Willebrand Factor - A high-molecular-weight plasma protein, produced by endothelial cells and megakaryocytes, that is part of the factor VIII/von Willebrand factor complex. The von Willebrand factor has receptors for collagen, platelets, and ristocetin activity as well as the immunologically distinct antigenic determinants. It functions in adhesion of platelets to collagen and hemostatic plug formation. The prolonged bleeding time in VON WILLEBRAND DISEASES is due to the deficiency of this factor.

Instructional Notations

Type 1 Excludes

A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

• antineoplastic antibiotics T45.1
• locally applied antibiotic NEC T49.0
• topically used antibiotic for ear, nose and throat T49.6
• topically used antibiotic for eye T49.5

7th Character Note

Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.

• The appropriate 7th character is to be added to each code from category T36

7th Character

Indicates that a seventh character is to be assigned to codes in a subcategory.

• A - initial encounter
• D - subsequent encounter
• S - sequela