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Official Description

C-reactive protein;

© Copyright 2026 American Medical Association. All rights reserved.

Common Language Description

The CPT® Code 86140 refers to the measurement of C-reactive protein (CRP) levels through a blood test. C-reactive protein is an acute phase protein that is produced by the liver and released into the bloodstream in response to inflammation and infection. This test is widely utilized in clinical settings due to its ability to indicate the presence of inflammation in the body, although it is important to note that it is not specific to any particular disease or condition. Instead, the CRP test serves as a general marker that can help healthcare providers monitor the body's response to various treatments or assess the necessity for additional diagnostic testing. Elevated levels of CRP can occur in a variety of situations, including during pregnancy, the use of oral contraceptives, or hormone replacement therapy. Furthermore, numerous diseases and conditions can lead to increased CRP levels, such as lymphoma, arteritis/vasculitis, osteomyelitis, inflammatory bowel disease, rheumatoid arthritis, pelvic inflammatory disease (PID), systemic lupus erythematosus (SLE), acute infections, burns, surgical procedures, and organ transplants. The blood sample for this test is typically obtained through venipuncture, which is a separately reportable procedure. In neonates, serum is tested using an immunoassay, while serum or plasma from all other patients is analyzed using a quantitative immunoturbidimetric method.

© Copyright 2026 Coding Ahead. All rights reserved.

1. Indications

The C-reactive protein (CRP) test is indicated for various clinical scenarios where inflammation is suspected or needs to be monitored. The following conditions and situations may warrant the performance of this test:

  • Monitoring Treatment Response The CRP test can be used to evaluate how well a patient is responding to treatment for inflammatory conditions.
  • Assessment of Inflammatory Diseases It aids in the diagnosis and monitoring of diseases such as rheumatoid arthritis, inflammatory bowel disease, and systemic lupus erythematosus (SLE).
  • Evaluation of Acute Infections The test can help assess the presence of acute infections that may cause inflammation.
  • Post-Surgical Monitoring CRP levels may be evaluated following surgical procedures to monitor for potential complications or infections.
  • Assessment of Organ Transplant Rejection It can be used to monitor for signs of rejection in organ transplant patients.
  • Pregnancy and Hormonal Treatments Elevated CRP levels may be observed during pregnancy or with the use of oral contraceptives and hormone replacement therapy.

2. Procedure

The procedure for measuring C-reactive protein levels involves several key steps that ensure accurate results. The first step is the collection of a blood sample, which is typically obtained through venipuncture. This involves inserting a needle into a vein, usually in the arm, to draw blood. The blood sample is then processed to separate the serum or plasma, which is necessary for the testing. In neonates, the serum is tested using an immunoassay method, which is a laboratory technique that uses antibodies to detect specific proteins. For all other patients, the serum or plasma is analyzed using a quantitative immunoturbidimetric method, which measures the concentration of CRP in the sample by assessing the turbidity caused by the formation of immune complexes. This quantitative approach provides precise levels of CRP, allowing healthcare providers to interpret the results in the context of the patient's clinical condition.

3. Post-Procedure

After the blood sample has been collected and processed, there are generally no specific post-procedure care requirements for the patient. However, it is important for healthcare providers to communicate the results of the CRP test to the patient and discuss any necessary follow-up actions based on the findings. If elevated CRP levels are detected, further evaluation may be warranted to determine the underlying cause of inflammation. Patients may also be advised to monitor for any symptoms that could indicate a worsening condition, depending on the context of the test and their overall health status.

Short Descr C-REACTIVE PROTEIN
Medium Descr C-REACTIVE PROTEIN
Long Descr C-reactive protein;
Status Code Statutory Exclusion (from MPFS, may be paid under other methodologies)
Global Days XXX - Global Concept Does Not Apply
PC/TC Indicator (26, TC) 9 - Not Applicable
Multiple Procedures (51) 9 - Concept does not apply.
Bilateral Surgery (50) 9 - Concept does not apply.
Physician Supervisions 09 - Concept does not apply.
Assistant Surgeon (80, 82) 9 - Concept does not apply.
Co-Surgeons (62) 9 - Concept does not apply.
Team Surgery (66) 9 - Concept does not apply.
Diagnostic Imaging Family 99 - Concept Does Not Apply
CLIA Waived (QW) No
APC Status Indicator Conditionally packaged laboratory tests
Type of Service (TOS) 5 - Diagnostic Laboratory
Berenson-Eggers TOS (BETOS) T1H - Lab tests - other (non-Medicare fee schedule)
MUE 1
CCS Clinical Classification 235 - Other Laboratory
90 Reference (outside) laboratory: when laboratory procedures are performed by a party other than the treating or reporting physician or other qualified health care professional, the procedure may be identified by adding modifier 90 to the usual procedure number.
Q4 Service for ordering/referring physician qualifies as a service exemption
GA Waiver of liability statement issued as required by payer policy, individual case
GW Service not related to the hospice patient's terminal condition
59 Distinct procedural service: under certain circumstances, it may be necessary to indicate that a procedure or service was distinct or independent from other non-e/m services performed on the same day. modifier 59 is used to identify procedures/services, other than e/m services, that are not normally reported together, but are appropriate under the circumstances. documentation must support a different session, different procedure or surgery, different site or organ system, separate incision/excision, separate lesion, or separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same individual. however, when another already established modifier is appropriate it should be used rather than modifier 59. only if no more descriptive modifier is available, and the use of modifier 59 best explains the circumstances, should modifier 59 be used. note: modifier 59 should not be appended to an e/m service. to report a separate and distinct e/m service with a non-e/m service performed on the same date, see modifier 25.
Q1 Routine clinical service provided in a clinical research study that is in an approved clinical research study
26 Professional component: certain procedures are a combination of a physician or other qualified health care professional component and a technical component. when the physician or other qualified health care professional component is reported separately, the service may be identified by adding modifier 26 to the usual procedure number.
GY Item or service statutorily excluded, does not meet the definition of any medicare benefit or, for non-medicare insurers, is not a contract benefit
77 Repeat procedure by another physician or other qualified health care professional: it may be necessary to indicate that a basic procedure or service was repeated by another physician or other qualified health care professional subsequent to the original procedure or service. this circumstance may be reported by adding modifier 77 to the repeated procedure or service. note: this modifier should not be appended to an e/m service.
X1 Continuous/broad services: for reporting services by clinicians, who provide the principal care for a patient, with no planned endpoint of the relationship; services in this category represent comprehensive care, dealing with the entire scope of patient problems, either directly or in a care coordination role; reporting clinician service examples include, but are not limited to: primary care, and clinicians providing comprehensive care to patients in addition to specialty care
91 Repeat clinical diagnostic laboratory test: in the course of treatment of the patient, it may be necessary to repeat the same laboratory test on the same day to obtain subsequent (multiple) test results. under these circumstances, the laboratory test performed can be identified by its usual procedure number and the addition of modifier 91. note: this modifier may not be used when tests are rerun to confirm initial results; due to testing problems with specimens or equipment; or for any other reason when a normal, one-time, reportable result is all that is required. this modifier may not be used when other code(s) describe a series of test results (eg, glucose tolerance tests, evocative/suppression testing). this modifier may only be used for laboratory test(s) performed more than once on the same day on the same patient.
QJ Services/items provided to a prisoner or patient in state or local custody, however the state or local government, as applicable, meets the requirements in 42 cfr 411.4 (b)
GZ Item or service expected to be denied as not reasonable and necessary
PN Non-excepted service provided at an off-campus, outpatient, provider-based department of a hospital
GC This service has been performed in part by a resident under the direction of a teaching physician
PD Diagnostic or related non diagnostic item or service provided in a wholly owned or operated entity to a patient who is admitted as an inpatient within 3 days
51 Multiple procedures: when multiple procedures, other than e/m services, physical medicine and rehabilitation services or provision of supplies (eg, vaccines), are performed at the same session by the same individual, the primary procedure or service may be reported as listed. the additional procedure(s) or service(s) may be identified by appending modifier 51 to the additional procedure or service code(s). note: this modifier should not be appended to designated "add-on" codes (see appendix d).
76 Repeat procedure or service by same physician or other qualified health care professional: it may be necessary to indicate that a procedure or service was repeated by the same physician or other qualified health care professional subsequent to the original procedure or service. this circumstance may be reported by adding modifier 76 to the repeated procedure or service. note: this modifier should not be appended to an e/m service.
95 Synchronous telemedicine service rendered via a real-time interactive audio and video telecommunications system: synchronous telemedicine service is defined as a real-time interaction between a physician or other qualified health care professional and a patient who is located at a distant site from the physician or other qualified health care professional. the totality of the communication of information exchanged between the physician or other qualified health care professional and the patient during the course of the synchronous telemedicine service must be of an amount and nature that would be sufficient to meet the key components and/or requirements of the same service when rendered via a face-to-face interaction. modifier 95 may only be appended to the services listed in appendix p. appendix p is the list of cpt codes for services that are typically performed face-to-face, but may be rendered via a real-time (synchronous) interactive audio and video telecommunications system.
AY Item or service furnished to an esrd patient that is not for the treatment of esrd
CC Procedure code change (use 'cc' when the procedure code submitted was changed either for administrative reasons or because an incorrect code was filed)
CR Catastrophe/disaster related
GV Attending physician not employed or paid under arrangement by the patient's hospice provider
KX Requirements specified in the medical policy have been met
PO Excepted service provided at an off-campus, outpatient, provider-based department of a hospital
Q0 Investigational clinical service provided in a clinical research study that is in an approved clinical research study
Q3 Live kidney donor surgery and related services
Q6 Service furnished under a fee-for-time compensation arrangement by a substitute physician or by a substitute physical therapist furnishing outpatient physical therapy services in a health professional shortage area, a medically underserved area, or a rural area
RT Right side (used to identify procedures performed on the right side of the body)
SA Nurse practitioner rendering service in collaboration with a physician
X5 Diagnostic services requested by another clinician: for reporting services by a clinician who furnishes care to the patient only as requested by another clinician or subsequent and related services requested by another clinician; this modifier is reported for patient relationships that may not be adequately captured by the above alternative categories; reporting clinician service examples include but are not limited to, the radiologist's interpretation of an imaging study requested by another clinician
XE Separate encounter, a service that is distinct because it occurred during a separate encounter
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
Date
Action
Notes
2010-01-01 Changed Code description changed.
2002-01-01 Changed Code description changed.
Pre-1990 Added Code added.
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