-cid-

DEFINITION of -cid-

The combining form -cid- (also appearing as -cide and -cidal) means killing, destroying, or an agent that kills. As a suffix (-cide), it forms nouns naming the act of killing or the agent responsible — germicide (an agent that kills germs), bactericide (kills bacteria), suicide (killing of oneself). As an adjective-forming suffix (-cidal), it describes the capacity or property of killing — bactericidal, virucidal, fungicidal. In medical and clinical contexts, -cid- terms are fundamental in infection control, pharmacology, and public health, where distinguishing between -cidal (kills) and -static (inhibits growth but does not kill) is a clinically critical distinction — for example, bactericidal vs. bacteriostatic antibiotics. For AAPC-certified inpatient profee coders, -cidal/-cide terminology surfaces most often in infectious disease documentation, pharmacy/toxicology records, and mental health (suicidal ideation/attempt) — all of which have direct ICD-10-CM coding implications that require specificity around intent, agent, and encounter type.

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ETYMOLOGY of -cid-

latin

• Origin: Latin -cīda (noun form) and -cīdium (act of killing) — from the verb caedere — “to cut, strike down, kill”
• Root verb: Latin caedō / caedere — “to cut, hew, fell, slay”
• Grammatical function in Latin: Combined with a preceding noun stem to form compound agent nouns and action nouns
• Meaning evolution:
  • Classical Latin: Used in legal and military contexts — homicīda (killer of a man), parricīda (killer of a parent/relative)
  • Scientific Latin (17th-19th c.): Extended broadly to chemistry and microbiology for agents that destroy microorganisms — germicīda, bactericīda
  • Modern medical usage: Standardized in pharmacology, infection control, and toxicology for both agents (-cide) and properties (-cidal)
• Entry into English: Directly from Latin and via Old French -cide, entering English from the 14th century onward
• Related roots: Shares Latin root caedere with -cis- (cut) and -sect- (cut apart); distinct from Greek -ktonia (killing) used in euthanasia

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RELATED TERMS to -cid-

-cid- Term	Combining Root	Meaning
germicide	o- (germ)	Agent that destroys microorganisms
bactericide	o- (bacteria)	Agent that kills bacteria
fungicide	fungi- (fungus)	Agent that kills fungi
virucide	viru- (virus)	Agent that destroys viruses
spermicide	o- (sperm)	Agent that kills sperm cells
parasiticide	o- (parasite)	Agent that kills parasites
insecticide	o- (insect)	Agent that kills insects
suicide	sui- (of oneself)	Act of killing oneself
homicide	homi- (man/person)	Act of killing a person

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CLINICAL & CODING USES (-cid- in medical documentation)

Infection Control & Pharmacology:

• Bactericidal vs bacteriostatic: Critical distinction — bactericidal agents kill the organism; bacteriostatic agents inhibit growth; drives antibiotic selection and documentation
• Germicide: Broad term used in hospital disinfection protocols — subcategorized as sporicide, tuberculocide, virucide, fungicide per CDC guidelines
• Spermicide: Topical contraceptive agent; surfaces in reproductive health documentation
• Pediculicide / scabicide: Agents targeting lice and scabies — coded under parasitic infestation diagnoses

Mental Health (High-Priority Coding Area):

• Suicidal ideation: Requires specificity — active vs. passive ideation; coded under ICD-10-CM R45.851 — billable and frequently queried in inpatient profee
• Suicide attempt: Coded with the injury/poisoning code first + T14.91XA/D/S for the attempt; always verify intent and encounter type (initial/subsequent/sequela)
• ⚠️ Profee Coding Tip: Suicidal ideation documented in a progress note alone does not automatically support a principal diagnosis — confirm provider attestation and clinical criteria

Profee Coding Tips:

• For -cidal drug therapies, verify HCPCS/NDC codes for antimicrobials administered during inpatient stay
• Modifier 59: May apply when a separate wound care/debridement encounter involves -cidal agent application distinct from another service
• Always distinguish bactericidal vs bacteriostatic in antimicrobial stewardship documentation — affects CC/MCC capture under ICD-10-PCS
• Homicide and assault sequelae are coded with external cause codes (X92-Y09 range) — required for trauma inpatient stays

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ICD-10 & CPT Quick Reference

✅ Valid & Billable ICD-10-CM Diagnosis Codes:

Code	Description
R45.851	Suicidal ideation
T14.91XA	Suicide attempt, initial encounter
T14.91XD	Suicide attempt, subsequent encounter
T14.91XS	Suicide attempt, sequela
B95.62	MRSA as cause of disease classified elsewhere
B96.89	Other specified bacterial agents as cause of disease classified elsewhere
Z77.098	Contact with and (suspected) exposure to other hazardous, chiefly nonmedicinal, chemicals (includes pesticides/insecticides)
T60.0X1A	Poisoning by organophosphate insecticides, accidental, initial encounter
T60.0X2A	Poisoning by organophosphate insecticides, intentional self-harm, initial encounter
B85.0	Pediculosis due to Pediculus humanus capitis
B86	Scabies

✅ Valid & Billable CPT Codes:

Code	Description
99213	Office visit, established patient — may document suicidal ideation screening
90839	Psychotherapy for crisis; first 60 minutes (suicidal crisis encounter)
90840	Psychotherapy for crisis; each additional 30 minutes (add-on to 90839)
96040	Medical genetics and genetic counseling services (germicidal/hereditary context)

✅ Valid Modifiers:

Modifier	Use
-59	Distinct procedural service — e.g., separate wound -cidal treatment vs. other same-session service
-25	Significant, separately identifiable E&M same day as procedure — e.g., suicidal ideation assessed same day as procedure
-52	Reduced services

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DERIVATIONS of -cid-

TABLE definition AS Definition
WHERE length(filter(roots, (word) => econtains(this.roots, word))) > 0 AND file.name != this.file.name
SORT file.name ASC

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Query functionality

TABLE definition AS Definition
FROM #medroot
WHERE length(filter(definition, (word) => econtains(this.definition, word))) > 0 AND file.name != this.file.name

Med roots dictionary Appendix A Prefixes Appendix B Combining Forms Appendix C Suffixes Appendix D Suffix forms