2027 ICD-10-CM Diagnosis Code R73.01Impaired fasting glucose
ICD-10-CM Codes›R00–R99›R70-R79›R73
- Billable — Valid for Submission
- Not Chronic
R73.01 is a billable ICD-10-CM diagnosis code for impaired fasting glucose. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 640 through 641. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. Coders also document this condition as impaired fasting glycemia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Abnormal findings without diagnosis.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Impaired fasting glycemia
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to R73.01: its own notes plus those printed at R73.0, R73, block R70-R79, and Chapter 18. A note printed at a category, block or chapter applies to every code under it.
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.
- Elevated fasting glucose
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
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.
- abnormal findings on antenatal screening of mother (O28.-)
- abnormalities of lipids (E78.-)
- abnormalities of platelets and thrombocytes (D69.-)
- abnormalities of white blood cells classified elsewhere (D70-D72)
- coagulation hemorrhagic disorders (D65-D68)
- diagnostic abnormal findings classified elsewhere - see Alphabetical Index
- hemorrhagic and hematological disorders of newborn (P50-P61)
Notes
General instructions on how these codes are used.
- This chapter includes symptoms, signs, abnormal results of clinical or other investigative procedures, and ill-defined conditions regarding which no diagnosis classifiable elsewhere is recorded.
- Signs and symptoms that point rather definitely to a given diagnosis have been assigned to a category in other chapters of the classification. In general, categories in this chapter include the less well-defined conditions and symptoms that, without the necessary study of the case to establish a final diagnosis, point perhaps equally to two or more diseases or to two or more systems of the body. Practically all categories in the chapter could be designated 'not otherwise specified', 'unknown etiology' or 'transient'. The Alphabetical Index should be consulted to determine which symptoms and signs are to be allocated here and which to other chapters. The residual subcategories, numbered .8, are generally provided for other relevant symptoms that cannot be allocated elsewhere in the classification.
- The conditions and signs or symptoms included in categories R00-R94 consist of:
- (a) cases for which no more specific diagnosis can be made even after all the facts bearing on the case have been investigated;
- (b) signs or symptoms existing at the time of initial encounter that proved to be transient and whose causes could not be determined;
- (c) provisional diagnosis in a patient who failed to return for further investigation or care;
- (d) cases referred elsewhere for investigation or treatment before the diagnosis was made;
- (e) cases in which a more precise diagnosis was not available for any other reason;
- (f) certain symptoms, for which supplementary information is provided, that represent important problems in medical care in their own right.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name R73.01, its category, or a range that includes it.
Excludes2 2
These codes carry an Excludes2 note naming R73.01: its condition is not part of those codes, and both may be reported when the patient has both.
- R94.7 Abnormal results of other endocrine function studiesabnormal glucose (R73.0-) names R73.0-, which includes this code
- Block R83-R89 Abnormal findings on examination of other body fluids, substances and tissues, without diagnosis
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Blood Glucose
Blood glucose, or blood sugar, is the main sugar found in your blood. It is your body's primary source of energy. It comes from the food you eat. Your body breaks down most of that food into glucose and releases it into your bloodstream. When your blood glucose goes up, it signals your pancreas to release insulin.
The full article covers:
- What is blood glucose?
- What is diabetes?
- What are blood glucose targets?
- When and how should I check my blood glucose?
- What happens if my blood glucose level becomes too high?
- What happens if my blood glucose level becomes low for me?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert R73.01 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About R73.01Overview
What is the ICD-10 code for impaired fasting glucose?
The ICD-10-CM code for impaired fasting glucose is R73.01 (sometimes written as R7301). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is R73.01 (Abnormal glucose) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report impaired fasting glucose on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does R73.01 group to?
When impaired fasting glucose is the principal diagnosis on an inpatient stay, it groups to MS-DRG 641, 640, with relative weights from 0.7864 to 1.3392 depending on complications. Higher weights mean higher Medicare reimbursement.
Can R73.01 be a principal diagnosis?
Use it with care. This is a symptom code, so once a definitive diagnosis explaining the impaired fasting glucose is established, that condition takes the principal position instead.
Can R73.01 be reported with a code from O99.81?
Not as a rule. The Excludes1 note at R73.0, which applies to R73.01, lists "abnormal glucose in pregnancy (O99.81-)". 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).
