2027 ICD-10-CM Diagnosis Code A18.03Tuberculosis of other bones
ICD-10-CM Codes›A00–B99›A15-A19›A18
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
A18.03 is a billable ICD-10-CM diagnosis code for tuberculosis of other bones. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 539 through 541, 974 through 976. 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 2 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Infective arthritis and Tuberculosis.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Bacterial osteomyelitis
- Infection of bone of pelvis and femur
- Multifocal tuberculosis
- Tuberculosis of bone
- Tuberculosis of bone of ankle and/or foot
- Tuberculosis of bone of forearm
- Tuberculosis of bone of hand
- Tuberculosis of bone of lower leg
- Tuberculosis of bone of lower limb
- Tuberculosis of bone of multiple sites
- Tuberculosis of bone of shoulder region
- Tuberculosis of bone of upper limb
- Tuberculosis of bones and/or joints
- Tuberculosis of humerus
- Tuberculosis of limb bones
- Tuberculosis of mastoid process
- Tuberculosis of multiple limb bones
- Tuberculosis of pelvis and femur
- Tuberculous dactylitis
- Tuberculous osteomyelitis
- Tuberculous osteonecrosis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to A18.03: its own notes plus those printed at block A15-A19 and 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.
- infections due to Mycobacterium tuberculosis and Mycobacterium bovis
- diseases generally recognized as communicable or transmissible
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Tuberculous mastoiditis
- Tuberculous osteomyelitis
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- congenital tuberculosis (P37.0)
- nonspecific reaction to test for tuberculosis without active tuberculosis (R76.1-)
- pneumoconiosis associated with tuberculosis, any type in A15 (J65)
- positive PPD (R76.11)
- positive tuberculin skin test without active tuberculosis (R76.11)
- sequelae of tuberculosis (B90.-)
- silicotuberculosis (J65)
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, if applicable, for associated cachexia (E88.A)
- 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 A18.03, its category, or a range that includes it.
Applicable To 1
These notes mention A18.03.
- O98.0 Tuberculosis complicating pregnancy, childbirth and the puerperium
Excludes1 2
These codes carry an Excludes1 note naming A18.03: they are not reported together with it, unless the two conditions are unrelated.
Excludes2 2
These codes carry an Excludes2 note naming A18.03: its condition is not part of those codes, and both may be reported when the patient has both.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
bone NEC A18.03
limb NEC (tuberculous) A18.03
mastoid process (chronic) See: Mastoiditis, chronic;
tuberculous A18.03
nose (tuberculous) A18.03
orbit (tuberculous) A18.03
tuberculous A18.03
tuberculous A18.03
Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) A15.9
bone A18.03
specified site NEC A18.03
bone A18.03
limb NEC A18.03
dactylitis A18.03
bone A18.03
finger A18.03
hand A18.03
iliac spine (superior) A18.03
jaw A18.03
mastoiditis A18.03
pelvis (bony) A18.03
blade A18.03
bone A18.03
skeletal NEC A18.03
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Bone Infections
Like other parts of the body, bones can get infected. The infections are usually bacterial, but can also be fungal. They may spread to the bone from nearby skin or muscles, or from another part of the body through the bloodstream.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert A18.03 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A18.03Overview
What is the ICD-10 code for tuberculosis of other bones?
The ICD-10-CM code for tuberculosis of other bones is A18.03 (sometimes written as A1803). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is A18.03 (Tuberculosis of bones and joints) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report tuberculosis of other bones on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does A18.03 group to?
When tuberculosis of other bones is the principal diagnosis on an inpatient stay, it groups to MS-DRG 974, 976, 975, 541, 539, 540, with relative weights from 0.7879 to 3.0488 depending on complications. Higher weights mean higher Medicare reimbursement.
Is A18.03 a CC or MCC?
CMS lists A18.03 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 2 closely related codes in its exclusion list.
Can A18.03 be reported with P37.0?
Not as a rule. The Excludes1 note at block A15-A19, which applies to A18.03, lists "congenital tuberculosis (P37.0)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
