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ICD-10-CM Codes
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R00-R99
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
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R50-R69
General symptoms and signs
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R51-
Headache
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2021 ICD-10-CM Diagnosis Code R51.9
2021 ICD-10-CM Diagnosis Code R51.9
Headache, unspecified
2021 - New Code Billable/Specific Code
- R51.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
- ICD-10-CM R51.9 is a new 2021 ICD-10-CM code that became effective on October 1, 2020.
- This is the American ICD-10-CM version of R51.9 - other international versions of ICD-10 R51.9 may differ.
The following code(s) above
R51.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
- Applicable To annotations, or
- Code Also annotations, or
- Code First annotations, or
- Excludes1 annotations, or
- Excludes2 annotations, or
- Includes annotations, or
- Note annotations, or
- Use Additional annotations
that may be applicable to
R51.9:
ICD-10-CM R51.9 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
- 102 Headaches with mcc
- 103 Headaches without mcc
Code History
- 2021 (effective 10/1/2020): New code
Code annotations containing back-references to R51.9:
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Type 1 Excludes: R52, G43, G44
ICD-10-CM Diagnosis Code R52
Pain, unspecified
2016 2017 2018 2019 2020 2021 Billable/Specific Code
Applicable To- Acute pain NOS
- Generalized pain NOS
- Pain NOS
Type 1 Excludes- acute and chronic pain, not elsewhere classified (G89.-)
- localized pain, unspecified type - code to pain by site, such as:
- abdomen pain (R10.-)
- back pain (M54.9)
- breast pain (N64.4)
- chest pain (R07.1-R07.9)
- ear pain (H92.0-)
- eye pain (H57.1)
- headache (R51.9)
- joint pain (M25.5-)
- limb pain (M79.6-)
- lumbar region pain (M54.5)
- pelvic and perineal pain (R10.2)
- shoulder pain (M25.51-)
- spine pain (M54.-)
- throat pain (R07.0)
- tongue pain (K14.6)
- tooth pain (K08.8)
- renal colic (N23)
- pain disorders exclusively related to psychological factors (F45.41)
ICD-10-CM Diagnosis Code G43
Migraine
2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
Note- the following terms are to be considered equivalent to intractable: pharmacoresistant (pharmacologically resistant), treatment resistant, refractory (medically) and poorly controlled
Type 2 Excludes- headache syndromes (G44.-)
Use Additional- code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
ICD-10-CM Diagnosis Code G44
Other headache syndromes
2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
Type 2 Excludes- atypical facial pain (G50.1)
- headache due to lumbar puncture (G97.1)
- migraines (G43.-)
- trigeminal neuralgia (G50.0)
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Type 2 Excludes: G89
ICD-10-CM Diagnosis Code G89
Pain, not elsewhere classified
2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
Code Also- related psychological factors associated with pain (F45.42)
Type 1 Excludes- generalized pain NOS (R52)
- pain disorders exclusively related to psychological factors (F45.41)
- pain NOS (R52)
- Headache R51.9
- chronic daily R51.9
- daily chronic R51.9
- nasal septum R51.9
- Pain(s) R52 - see also Painful
ICD-10-CM Diagnosis Code R52
Pain, unspecified
2016 2017 2018 2019 2020 2021 Billable/Specific Code
Applicable To- Acute pain NOS
- Generalized pain NOS
- Pain NOS
Type 1 Excludes- acute and chronic pain, not elsewhere classified (G89.-)
- localized pain, unspecified type - code to pain by site, such as:
- abdomen pain (R10.-)
- back pain (M54.9)
- breast pain (N64.4)
- chest pain (R07.1-R07.9)
- ear pain (H92.0-)
- eye pain (H57.1)
- headache (R51.9)
- joint pain (M25.5-)
- limb pain (M79.6-)
- lumbar region pain (M54.5)
- pelvic and perineal pain (R10.2)
- shoulder pain (M25.51-)
- spine pain (M54.-)
- throat pain (R07.0)
- tongue pain (K14.6)
- tooth pain (K08.8)
- renal colic (N23)
- pain disorders exclusively related to psychological factors (F45.41)
ICD-10-CM Codes Adjacent To R51.9
R50 Fever of other and unknown origin
R50.8 Other specified fever
R50.81 Fever presenting with conditions classified elsewhere
R50.84 Febrile nonhemolytic transfusion reaction
R51.0 Headache with orthostatic component, not elsewhere classified
R51.9
Headache, unspecified
R53.0 Neoplastic (malignant) related fatigue
R53.2 Functional quadriplegia
R53.8 Other malaise and fatigue
R53.82 Chronic fatigue, unspecified
R54 Age-related physical debility
Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.