2027 ICD-10-CM Diagnosis Code A07.1Giardiasis [lambliasis]
ICD-10-CM Codes›A00–B99›A00-A09›A07
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
A07.1 is a billable ICD-10-CM diagnosis code for giardiasis [lambliasis]. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 371 through 373. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 67 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Intestinal infection; and Parasitic, other specified and unspecified infections.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Colitis caused by protozoan
- Disease caused by Hexamitidae
- Giardia lamblia colitis
- Giardia lamblia duodenitis
- Giardia lamblia enteritis of intestine
- Giardia lamblia enteritis of small intestine
- Infection caused by Giardia duodenalis
- Parasitic infection causing colitis
- Parasitic infection causing inflammation of small intestine
- Protozoal enteritis of small intestine
- Recurrent infection caused by Protozoa
- Recurrent infection of gastrointestinal tract
- Recurrent infection of intestine caused by Giardia lamblia
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to A07.1: its own notes plus those printed at Chapter 1. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- diseases generally recognized as communicable or transmissible
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify resistance to antimicrobial drugs (Z16.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name A07.1, its category, or a range that includes it.
Excludes1 2
These codes carry an Excludes1 note naming A07.1: they are not reported together with it, unless the two conditions are unrelated.
- A06 Amebiasisother protozoal intestinal diseases (A07.-) names A07.-, which includes this code
- Block B50-B64 Protozoal diseasesother protozoal intestinal diseases (A07.-) names A07.-, which includes this code
Excludes2 2
These codes carry an Excludes2 note naming A07.1: its condition is not part of those codes, and both may be reported when the patient has both.
- Block P35-P39 Infections specific to the perinatal period
- P37 Other congenital infectious and parasitic diseases
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) See Also: Enteritis; K52.9
giardial A07.1
Dysentery, dysenteric (catarrhal) (diarrhea) (epidemic) (hemorrhagic) (infectious) (sporadic) (tropical) A09
Giardia lamblia A07.1
Lamblia A07.1
Giardiasis A07.1
Giardia lamblia A07.1
Lambliasis, lambliosis A07.1
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Giardiasis
an infection of the small intestine caused by the flagellated protozoan giardia. it is spread via contaminated food and water and by direct person-to-person contact.
Patient EducationClinical
Giardia Infections
Giardiasis is an illness caused by a parasite called Giardia intestinalis. It lives in soil, food, and water. It may also be on surfaces that have been contaminated with waste. You can become infected if you swallow the parasite. You can also get it if you're exposed to human feces (poop) through sexual contact.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert A07.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A07.1Overview
What is the ICD-10 code for giardiasis [lambliasis]?
The ICD-10-CM code for giardiasis [lambliasis] is A07.1 (sometimes written as A071). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is A07.1 (Other protozoal intestinal diseases) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report giardiasis [lambliasis] on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does A07.1 group to?
When giardiasis [lambliasis] is the principal diagnosis on an inpatient stay, it groups to MS-DRG 372, 371, 373, with relative weights from 0.6945 to 1.7087 depending on complications. Higher weights mean higher Medicare reimbursement.
Is A07.1 a CC or MCC?
CMS lists A07.1 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 67 closely related codes in its exclusion list.
What is the ICD-9 equivalent of A07.1?
Under the General Equivalence Mappings, giardiasis [lambliasis] converts to ICD-9-CM 007.1 (giardiasis). The mapping is a direct match.
