MS-DRG · FY 2026 v43.0
MS-DRG 103 – Headaches without MCC
A Medical DRG in MDC 01 (Diseases & Disorders of the Nervous System). Inpatient cases group to DRG 103 when the ICD-10-CM principal diagnosis is one of the 95 codes listed below and no secondary diagnosis on the MCC list is present. Its FY 2026 relative weight is 0.8363 with a geometric mean length of stay of 2.3 days.
Medical DRG – assigned by principal diagnosis✓ Official CMS v43.0 dataset
0.8363
Relative Weight
2.3
Geometric Mean LOS (days)
2.9
Arithmetic Mean LOS (days)
95
Principal Diagnosis Codes
Severity family
DRG 102with MCCWeight 1.1209 · GMLOS 2.9 daysDRG 103without MCCWeight 0.8363 · GMLOS 2.3 days
How a case is assigned to DRG 103
The grouper first assigns the case to MDC 01 from the principal diagnosis and finds no qualifying operating-room procedure (this is a Medical DRG; ICD-10-PCS codes do not drive assignment here), then applies the severity split from secondary diagnoses: with MCC → 102; without MCC → 103.
ICD-10-CM
Principal Diagnosis Codes 95 codes · 8 categories
95 of 95 shown
F07 Personality and behavioral disorders due to known physiological condition1 code
- F07.81 Postconcussional syndrome
G43 Migraine48 codes
- G43.001 Migraine without aura, not intractable, with status migrainosus
- G43.009 Migraine without aura, not intractable, without status migrainosus
- G43.011 Migraine without aura, intractable, with status migrainosus
- G43.019 Migraine without aura, intractable, without status migrainosus
- G43.101 Migraine with aura, not intractable, with status migrainosus
- G43.109 Migraine with aura, not intractable, without status migrainosus
- G43.111 Migraine with aura, intractable, with status migrainosus
- G43.119 Migraine with aura, intractable, without status migrainosus
- G43.401 Hemiplegic migraine, not intractable, with status migrainosus
- G43.409 Hemiplegic migraine, not intractable, without status migrainosus
- G43.411 Hemiplegic migraine, intractable, with status migrainosus
- G43.419 Hemiplegic migraine, intractable, without status migrainosus
- G43.501 Persistent migraine aura without cerebral infarction, not intractable, with status migrainosus
- G43.509 Persistent migraine aura without cerebral infarction, not intractable, without status migrainosus
- G43.511 Persistent migraine aura without cerebral infarction, intractable, with status migrainosus
- G43.519 Persistent migraine aura without cerebral infarction, intractable, without status migrainosus
- G43.601 Persistent migraine aura with cerebral infarction, not intractable, with status migrainosus
- G43.609 Persistent migraine aura with cerebral infarction, not intractable, without status migrainosus
- G43.611 Persistent migraine aura with cerebral infarction, intractable, with status migrainosus
- G43.619 Persistent migraine aura with cerebral infarction, intractable, without status migrainosus
- G43.701 Chronic migraine without aura, not intractable, with status migrainosus
- G43.709 Chronic migraine without aura, not intractable, without status migrainosus
- G43.711 Chronic migraine without aura, intractable, with status migrainosus
- G43.719 Chronic migraine without aura, intractable, without status migrainosus
- G43.801 Other migraine, not intractable, with status migrainosus
- G43.809 Other migraine, not intractable, without status migrainosus
- G43.811 Other migraine, intractable, with status migrainosus
- G43.819 Other migraine, intractable, without status migrainosus
- G43.821 Menstrual migraine, not intractable, with status migrainosus
- G43.829 Menstrual migraine, not intractable, without status migrainosus
- G43.831 Menstrual migraine, intractable, with status migrainosus
- G43.839 Menstrual migraine, intractable, without status migrainosus
- G43.901 Migraine, unspecified, not intractable, with status migrainosus
- G43.909 Migraine, unspecified, not intractable, without status migrainosus
- G43.911 Migraine, unspecified, intractable, with status migrainosus
- G43.919 Migraine, unspecified, intractable, without status migrainosus
- G43.A0 Cyclical vomiting, in migraine, not intractable
- G43.A1 Cyclical vomiting, in migraine, intractable
- G43.B0 Ophthalmoplegic migraine, not intractable
- G43.B1 Ophthalmoplegic migraine, intractable
- G43.C0 Periodic headache syndromes in child or adult, not intractable
- G43.C1 Periodic headache syndromes in child or adult, intractable
- G43.D0 Abdominal migraine, not intractable
- G43.D1 Abdominal migraine, intractable
- G43.E01 Chronic migraine with aura, not intractable, with status migrainosus
- G43.E09 Chronic migraine with aura, not intractable, without status migrainosus
- G43.E11 Chronic migraine with aura, intractable, with status migrainosus
- G43.E19 Chronic migraine with aura, intractable, without status migrainosus
G44 Other headache syndromes40 codes
- G44.001 Cluster headache syndrome, unspecified, intractable
- G44.009 Cluster headache syndrome, unspecified, not intractable
- G44.011 Episodic cluster headache, intractable
- G44.019 Episodic cluster headache, not intractable
- G44.021 Chronic cluster headache, intractable
- G44.029 Chronic cluster headache, not intractable
- G44.031 Episodic paroxysmal hemicrania, intractable
- G44.039 Episodic paroxysmal hemicrania, not intractable
- G44.041 Chronic paroxysmal hemicrania, intractable
- G44.049 Chronic paroxysmal hemicrania, not intractable
- G44.051 Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), intractable
- G44.059 Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), not intractable
- G44.091 Other trigeminal autonomic cephalgias (TAC), intractable
- G44.099 Other trigeminal autonomic cephalgias (TAC), not intractable
- G44.1 Vascular headache, not elsewhere classified
- G44.201 Tension-type headache, unspecified, intractable
- G44.209 Tension-type headache, unspecified, not intractable
- G44.211 Episodic tension-type headache, intractable
- G44.219 Episodic tension-type headache, not intractable
- G44.221 Chronic tension-type headache, intractable
- G44.229 Chronic tension-type headache, not intractable
- G44.301 Post-traumatic headache, unspecified, intractable
- G44.309 Post-traumatic headache, unspecified, not intractable
- G44.311 Acute post-traumatic headache, intractable
- G44.319 Acute post-traumatic headache, not intractable
- G44.321 Chronic post-traumatic headache, intractable
- G44.329 Chronic post-traumatic headache, not intractable
- G44.40 Drug-induced headache, not elsewhere classified, not intractable
- G44.41 Drug-induced headache, not elsewhere classified, intractable
- G44.51 Hemicrania continua
- G44.52 New daily persistent headache (NDPH)
- G44.53 Primary thunderclap headache
- G44.59 Other complicated headache syndrome
- G44.81 Hypnic headache
- G44.82 Headache associated with sexual activity
- G44.83 Primary cough headache
- G44.84 Primary exertional headache
- G44.85 Primary stabbing headache
- G44.86 Cervicogenic headache
- G44.89 Other headache syndrome
G93 Other disorders of brain1 code
- G93.2 Benign intracranial hypertension
G97 Intraoperative and postprocedural complications and disorders of nervous system, not elsewhere classified1 code
- G97.1 Other reaction to spinal and lumbar puncture
I67 Other cerebrovascular diseases1 code
- I67.7 Cerebral arteritis, not elsewhere classified
I68 Cerebrovascular disorders in diseases classified elsewhere1 code
- I68.2 Cerebral arteritis in other diseases classified elsewhere
ICD-10-PCS
Procedure Codes
Procedure codes do not drive assignment for this DRG. DRG 103 is a Medical DRG, assigned from the principal diagnosis above.
Frequently Asked Questions
What is MS-DRG 103?
MS-DRG 103 (Headaches without MCC) is a medical DRG in MDC 01 (Diseases & Disorders of the Nervous System). Its FY 2026 relative weight is 0.8363 with a geometric mean length of stay of 2.3 days.
What is the difference between DRG 102, 103?
All 2 share the same base category; the severity of secondary diagnoses separates them: 102 (with MCC), 103 (without MCC). A major complication or comorbidity (MCC) places the case in the highest-weighted DRG of the family; a CC in the middle; neither in the lowest.
How many diagnosis codes group to DRG 103?
95 ICD-10-CM principal diagnosis codes group to this DRG, spanning 8 three-character categories.
What is the relative weight of DRG 103?
The FY 2026 relative weight of this DRG is 0.8363, meaning reimbursement of roughly 0.84 times the average Medicare inpatient case. Multiply by a hospital's blended base rate for the approximate payment.
Source: CMS ICD-10 MS-DRG v43.0 Definitions Manual and the FY 2026 IPPS Final Rule (Table 5), effective October 1, 2025 through September 30, 2026. We publish the DRG assignments as CMS defines them and add the navigation, search, and code links.
