2027 ICD-10-CM Diagnosis Code R51.0Headache with orthostatic component, not elsewhere classified

ICD-10-CM Codes›R00–R99›R50-R69›R51

ICD-10-CM R51.0
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

R51.0 is a billable ICD-10-CM diagnosis code for headache with orthostatic component, not elsewhere classified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 102 through 103. 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 orthostatic headache. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Headache; including migraine and Nervous system signs and symptoms.

This medical diagnosis code is frequently used in Family Practice medical specialties to designate conditions such headache.

Code Identity

ICD-10-CM Code
R51.0
Billable Status
Yes — Valid for Submission
Code Describes
Headache with orthostatic component, not elsewhere classified
Short Description
Headache with orthostatic component, NEC
Parent Code
R51
Headache

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR50-R69General symptoms and signs
CategoryR51Headache
This CodeR51.0Headache with orthostatic component, not elsewhere classified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Orthostatic headache

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to R51.0: its own notes plus those printed at R51 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.

  • Headache with positional component, not elsewhere classified

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.

From R51 Headache applies to 2 codes
  • atypical face pain (G50.1)
  • migraine and other headache syndromes (G43-G44)
  • trigeminal neuralgia (G50.0)
From Chapter 18 (R00-R99) Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified applies to 774 codes
  • abnormal findings on antenatal screening of mother (O28.-)
  • certain conditions originating in the perinatal period (P04-P96)
  • signs and symptoms classified in the body system chapters
  • signs and symptoms of breast (N63, N64.5)

Notes

General instructions on how these codes are used.

From Chapter 18 (R00-R99) Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified applies to 774 codes
  • 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 R51.0, its category, or a range that includes it.

Excludes2 1

These codes carry an Excludes2 note naming R51.0: its condition is not part of those codes, and both may be reported when the patient has both.

  • G44.8 Other specified headache syndromes
    headache with orthostatic or positional component, not elsewhere classified (R51.0)

Code Also 1

These codes say R51.0 may also be needed to fully describe the condition. The note gives no sequencing direction.

  • G97.1 Other reaction to spinal and lumbar puncture
    if applicable, any associated headache with orthostatic component (R51.0)

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.

CCSR NVS010
Headache; including migraine
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR SYM010
Nervous system signs and symptoms
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Headache

    the symptom of pain in the cranial region. it may be an isolated benign occurrence or manifestation of a wide variety of headache disorders.

Patient EducationClinical

Headache

Almost everyone has had a headache. Headache is the most common form of pain. It's a major reason people miss days at work or school or visit the doctor.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code History & ChangesHistory

Replacement R51.0 replaces the following previously assigned code(s):

  • R51 - Headache
FY 2021AddedAdded to the ICD-10-CM code setEffective October 1, 2020.
FY 2022–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About R51.0Overview

What is the ICD-10 code for headache with orthostatic component, not elsewhere classified?

The ICD-10-CM code for headache with orthostatic component, not elsewhere classified is R51.0 (sometimes written as R510). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is R51.0 (Headache) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report headache with orthostatic component, not elsewhere classified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does R51.0 group to?

When headache with orthostatic component, not elsewhere classified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 102, 103, with relative weights from 0.8219 to 1.1200 depending on complications. Higher weights mean higher Medicare reimbursement.

Can R51.0 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the headache with orthostatic component, not elsewhere classified is established, that condition takes the principal position instead.